Internal anatomy of the skull base, lateral view, and base of the skull. Procedures, 2002 The floor and the lateral walls are grooved for the middle meningeal artery, which courses anterolaterally from the foramen spinosum and which divides into frontal and parietal branches. The floor is grooved for the cerebellar hemispheres, and the midline internal occipital crest runs from the foramen magnum to the internal occipital protuberance. 7.Tumors. Posteriorly, the occipital bone forms the bulk of the posterior skull base and creates the foramen … The foramen cecum sits between the frontal crest and the prominent crista galli and is a site of communication between the draining veins of the nasal cavity and the superior sagittal sinus. 5th. Cervicogenic headaches are different because they are caused by problems with the nerves, bones, or muscles in your neck. The cranium (skull) is the skeletal structure of the head that supports the face and protects the brain.It is subdivided into the facial bones and the brain case, or cranial vault (Figure 6.16).The facial bones underlie the facial structures, form the nasal cavity, enclose the eyeballs, and support the teeth of the upper and lower jaws. They can originate in the skull base as a primary tumor or spread there from a cancer elsewhere in the body as a metastatic brain tumor. This pain is usually … Simply put, the skull base refers to the base or floor of the cranium, the part of the skull on which the brain rests. American Journal of Neuroradiology. Learn more about the anatomy and function of the skull in humans and other vertebrates. In this region lies the sigmoid groove for the ICA as it traverses the petrous apex through the cavernous sinus. Please confirm that you would like to log out of Medscape. The frontal bone forms the lateral boundaries. Both nerves send branches to the parasympathetic sphenopalatine ganglion. These can act as conduits for transmission of diseases from the deep spaces of the neck into the intracranial compartment and vice versa. Sellar pneumatization of the sinus facilitates entry during transsphenoidal approaches. The frontal sinuses arise as evaginations of ethmoid air cells into the frontal bone and have a thick anterior and thinner posterior wall. Neck muscles attach to the occipital bone at the bony landmark called the external occipital protuberance. Pain at base of skull causing dizziness, inability to walk and frequent weight loss. Bottom Line: Pain at base of skull or pain in back of head at base of skull is caused by different reasons such as tension headaches, occipital neuralgia, brain tumors, muscle or nerve injury near cervical area, arthritis etc. Tables 2.1 and 2.2 summarize the foramina of the endocranial surface and the exocranial surface of the skull base with its contents, respectively. Base of the skull (exterior view): bony case of the brain of vertebrates. [Full Text]. Zygomatic process temporal: bony outgrowth of the cheek bone on the temporal bone. The vertebral artery originates from the subclavian artery and has 4 parts: cervical, foraminal, atlantic, and subarachnoid. Thieme Medical; 2005. The occipital, vomer, maxillary, and zygomatic bones are coloured red. The atlantic portion is encountered in the suboccipital triangle of the nuchal region and is covered by the semispinalis capitis muscle. The internal maxillary artery, one of the terminal branches of the external carotid artery, provides blood to these muscles and should be preserved in case a temporalis flap is necessary to reconstruct skull base defects. Sandeep Kathju, MD, PhD Consulting Staff, Divisions of Plastic Surgery, Otolaryngology-Head and Neck Surgery, and Oral/Maxillofacial Surgery, Allegheny General Hospital, Western Pennsylvania Hospital; Director, Wound Healing Program, Allegheny-Singer Research Institute • The bones, which form the skull base, are the frontal, sphenoid, ethmoid, temporal, and occipital bones (the anterior part of the exocranial surface is also formed by the zygomatic, maxillary, and palatine bones). Zygomatic process temporal: bony outgrowth of the cheek bone on the temporal bone. Pain or headaches at the base of your skull are often the result of tight muscles in the back of your neck due to tension, stress, or fatigue. The deep lobe of the parotid gland and the accompanying facial nerve (CN VII) and its branches may be encountered in the lateral aspect of the extracranial skull base. The inferior petrosal sinus usually enters this portion of the jugular foramen between CNs IX and X, but its path is highly variable. Symptoms may include bruising behind the ears, bruising around the eyes, or blood behind the ear drum. For example, swelling in the lymph nodes of your throat typically indicate some type of throat infection. Structures first identified in the infratemporal fossa include the muscles of mastication, namely, the temporalis, masseter, and medial and lateral pterygoid muscles. Small brain aneurysm usually goes undetected until problems get worse. Philadelphia, PA: Elsevier; 2010. chap 173. It is composed of the endocranium and the lower parts of the skull roof. The base of skull, also known as the cranial base or the cranial floor, is the most inferior area of the skull. The jugular foramen extends laterally from the posterior aspect of the occipital condyle. Dissecting further in a medial direction reveals the cartilaginous eustachian tube and the tensor and levator veli palatini muscles. The pterion is an H -shaped suture, where the frontal bone, the greater wing of the sphenoid bone, the squamous temporal bone, and the parietal bone meet. Symptoms will vary, depending on the origin and site of the tumor. Small brain aneurysm usually goes undetected until problems get worse. The mastoid tip serves as the origin for the sternocleidomastoid, while the posterior digastric muscle originates deep to this area. The nasopharynx lies posterior and inferior to the sphenoid sinus along the midline. The average latency interval from the completion of RT to the diagnosis of skull base ORN was 45.57 months. Skull base tumors In rare instances, a bump on the back of the head can be a bone tumor . The GSPN, which is composed of parasympathetic fibers from the facial nerve to the lacrimal gland, is an important surgical landmark. The result is cavernous sinus thrombosis. (4, 6, and 8) The temporal and palate bones, blue. Fig. The skull base can be subdivided into 3 regions: the anterior, middle, and posterior cranial fossae. Read the article to know why and how to relieve a tension headache at the base of skull. Lyons BM. These 2 regions combine to form the midline clivus. The incidence of skull base ORN was 1.04%. The sphenoid and parietal bones, and the teeth, are left uncoloured. In the midline, it forms the diaphragma sellae—a circular dural plate—which covers the pituitary gland. January 2006. Flint PW, et al. Pressure in the face Other types of skull base tumors may cause symptoms: 1. Ear and lateral skull base. The superior sagittal sinus drains the superior cerebral and frontal diploic veins of Breschet. Pain at base of skull causing dizziness, inability to walk and frequent weight loss. The posterior skull base is formed by the temporal, sphenoid, and occipital bones. Trouble breathing through the nose 5. CN VII continues through the temporal bone, the middle ear, and the mastoid bone to exit at the stylomastoid foramen and innervate the facial nerve musculature. These are the Anterior, Middle and Posterior Cranial Fossae. The body of the sphenoid makes up the central portion of the middle fossa and houses the sella turcica. Dehiscence may be present in the lateral wall of the sphenoid, resulting in exposure of the carotid artery, optic nerve, or vidian nerve. The sulcus for the inferior petrosal sinus sits posterior to the clivus and anterior to the petrous apex. (See the image below.). (See the image below.). These veins form a potential pathway for infection to spread intracranially, causing complications such as sagittal sinus thrombosis, empyema, and abscess. Bulging eyes 5. When viewed from the extracranial lateral aspect, the infratemporal fossa lies below the temporal bone, inferomedial to the zygomatic arch, and posterior to the maxilla. The course can be divided into 4 parts: cervical, intratemporal, cavernous, and supracavernous.The cervical portion passes near the third and fourth cervical vertebrae. The last segment turns backward under the optic nerve to the anterior perforated substance, where it joins the circle of Willis through its terminal anterior and middle cerebral arteries. Table 2.3 summarizes the foramina and other structures visible on the splanchnocranium (). Along with the investing pharyngobasilar fascia and the superior pharyngeal constrictor muscle, it helps to form the lateral portion of the choana and part of the lateral portion of the nasopharynx. 1 You can find the approximate location of the occipital lymph nodes if you put your hand just at the nape of your neck. At this point, it is medial to the eustachian tube and anterolateral and inferior to the cochlea. The GSPN and rostral LSPN run along the floor beneath the dura and parallel the anterior edge of the petrous bone into foramen lacerum. The posterior limit is the clivus, which is formed from the sphenoid and occipital bones. The skull includes the upper jaw and the cranium. It is created by the passage of the levator veli palatini and the cartilaginous eustachian tube through the superior constrictor muscle. It transmits the hypoglossal nerve (CN XII), a meningeal branch of the ascending pharyngeal artery, and the hypoglossal venous plexus. Philadelphia, Pa: Lippincott Williams & Wilkins; 2001. Treatment: In most cases, the swelling will go away on its own, but you may need to take antibiotics if the swelling is due to a bacterial infection. Your ability to run, jump, write with a pen, laugh, and experience pain all start in the brain. The midbrain, the pons, the medulla, and the cerebral and cerebellar hemispheres lie in the posterior fossa. 247-91. • Perspective of individual bones – Components – Apertures – Transmitted structures 3. Basilar fractures of the skull, also known as base of skull fractures, are a common form of skull fracture, particularly in the setting of severe traumatic head injury, and involve the base of the skull.They may occur in isolation or often in continuity with skull vault fractures or facial fractures. New York, NY: Thieme Medical; 1999. Cranial venous sinuses and the basilar plexus. The maxillary nerve enters through the foramen rotundum and branches thereafter to supply sensory information from regions of the face. Directly superior to the nasopharynx is the foramen lacerum and the ICA, just before its entry point into the cavernous sinus. In the case of such fistulas, traumatic tears of the intracavernous carotid result in high-pressure arterial blood flooding the cavernous sinus. Blurry or double vision 2. CN's VII and VIII and the nervus intermedius exit through the porus acusticus, and nerves IX, X, and XI traverse the jugular foramen. Anomalous Intracranial Drainage of the Nasal Mucosa: A Vein of the Foramen Caecum?. As the skull base provides a frontier between the intracranial compartment and the extracranial head and neck, the first and most important issue in the differential diagnosis of a skull base lesion is to decide its site of origin: the bone elements of the skull base proper, the intracranial compartment, or … The sella turcica can be found between the anterior and posterior clinoid processes and is composed of 3 sections. The tegmen is a thin plate of bone that separates the dura of the middle lobe from the middle ear and the mastoid cavity. The fovea ethmoidalis, or the roof of the ethmoid cavity, continues laterally from the cribriform plate. Skull base tumors are classified by tumor type and location within the skull base. For this, the doctor will press firmly around the back of the head and base of the skull in an attempt to reproduce the pain through touch. The eustachian tube originates at the protympanum and runs anteromedially and inferiorly. The bones that make up the skull base include: 1 You can find the approximate location of the occipital lymph nodes if you put your hand just at the nape of your neck. The lateral margin consists of primarily the squamous and petrous portions of the temporal bone. Teari… The anterior aspect of the petrous temporal bone forms the posterior floor of the middle cranial fossa. It then passes medially along the groove on the posterior arch of the atlas and pierces the atlantooccipital membrane to enter the vertebral canal and subarachnoid space. The anterior clinoid processes and the planum sphenoidale, which forms the roof of the sphenoid sinus, mark the posterior limit. The posterior inferior cerebellar arteries usually branch off from the vertebral arteries before forming the midline basilar artery at the base of the pons. Exocranial (external) surface (Fig. Surgical approaches in this area allow mobilization of the vertebral artery and access to the foramen magnum. Structures found at the base of the skull are for example: There are five bones that make up the base of the skull: Base of skull - crista galli, cribriform plate and foramen cecum, The anterior, middle and posterior cranial fossa in different colors, Inferior area of the skull, composed of the endocranium and lower parts of the skull roof. The posteroinferior boundary is the parapharyngeal space. The base of skull, also known as the cranial base or the cranial floor, is the most inferior area of the skull. The cranium (skull) is the skeletal structure of the head that supports the face and protects the brain.It is subdivided into the facial bones and the brain case, or cranial vault (Figure 1).The facial bones underlie the facial structures, form the nasal cavity, enclose the … Palatine suture: seam joining the palate and the jaw. The sinus of Morgagni is a weak point in the superolateral nasopharyngeal wall. On traversing the roof of the cavernous sinus medial to the anterior clinoid process, the ICA enters the supracavernous portion. Note the yellowish hue of the central part of the temporal pyramid caused by the osseous labyrinth's solid compact bone. The former ascends across to the pterion, where it courses posteriorly. Although, for the most part, it affects the arteries along the base of the skull. The jugular tubercle may be medial to the lower aspect of the jugular foramen, and it serves as a landmark for the hypoglossal foramen. Important structures in the middle fossa include but, are not limited to, the temporal lobe, the pituitary gland, the trigeminal or gasserian ganglion, the greater superficial petrosal nerve (GSPN), the intracranial portion of the ICA, and the cavernous sinus and its contents. Anatomy of the skull base, temporal bone, external ear, and middle ear. Along the lateral wall runs the ICA, which gives off 2-6 caroticocavernous branches that supply the hypophysis and that join branches from the middle meningeal artery. The foramen sits near the lateral wall of the sphenoid sinus. Meningitis is a complication in about 14% of cases. A crackling or a popping sound at the base of the skull is commonly an indication of TMJ problems. 173. https://profreg.medscape.com/px/getpracticeprofile.do?method=getProfessionalProfile&urlCache=aHR0cHM6Ly9lbWVkaWNpbmUubWVkc2NhcGUuY29tL2FydGljbGUvODgyNjI3LW92ZXJ2aWV3. The basilar artery then branches into the anterior inferior cerebellar arteries, which travel to the cerebellopontine angle in close relationship to CN's VII and VIII. Duckert LG. At this point, it is deep to the posterior digastric muscle and styloid process and superior and posteromedial to the external carotid artery. Located at the base of the skull is the occipital bone 1. The base of the skull is a bony diaphragm composed of a number of bones - from anterior to posterior: frontal bone; ethmoid bone; sphenoid bone; parietal bone; temporal bone; occipital bone; These bones are separated from each other by sutures. A surgeon must have knowledge of the outer regions of the skull base, because these regions often serve as access points during surgery. The olfactory bulb lies along the medial edge of the frontal orbital plate and connects with the olfactory tract, which courses above the cribriform plate and planum sphenoidale. [Full Text]. In the medial aspect, the lesser wing of the sphenoid forms the anterior clinoid process, an important landmark for the optic nerve and supracavernous internal carotid artery (ICA). Location of skull base tumors: Certain tumors and conditions tend to occur in specific areas of the skull base. Beginning lateral to the clinoid process anteriorly, the SOF extends inferomedially and toward the orbital apex and transmits the oculomotor nerve (CN III); the trochlear nerve (CN IV); the lacrimal, frontal, and nasociliary branches of CN V1; and the abducens nerve (CN VI). It transmits the endolymphatic duct. Once the foramen ovale is identified, the foramen spinosum is easily identifiable immediately posterior to the foramen. These bones are located right at the base of the skull, so it makes sense that a misalignment could exist if this is where your pain occurs. Grooves for the superior sagittal sinus are superior to the internal occipital protuberance. The ICA enters the petrous bone through the carotid foramen and runs cranially into the foramen lacerum. This plate serves as a marker for the foramen rotundum, which lies immediately anterior to it, as well as for the foramen ovale, which lies immediately posterior. Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug ReferenceDisclosure: Received salary from Medscape for employment. The horizontal grooves for the paired transverse sinuses can be found lateral to the internal occipital protuberance. The ethmoid sinuses can be found inferior to the anterior cranial fossa and medial to the orbits. The bone of the floor of the middle fossa may be dehiscent over the geniculate ganglion of the facial nerve. The pterygoid venous system can be highly variable in this region. The suboccipital triangle is superficial to the ligaments connecting the atlas to the axis and contains the occipital artery, the vertebral artery, a complex of veins, the greater occipital nerve, and the C1 nerve. The medial wall transmits the anterior and posterior ethmoid arteries through their respective foramina. , On entering the posterior fossa through the foramen magnum, the vertebral arteries ascend ventral to the roots of CNs IX, X, and XI. The posteriormost segment of the lateral orbital wall forms the anterior wall of the middle cranial fossa and is discussed in greater detail in the next section. The 3 divisions of the trigeminal nerve traverse inferior to the tentorium cerebelli into the Meckel cave, within the subarachnoid space. It is important to avoid disrupting the lateral wall during instrumentation, because the ICA and optic nerve are just lateral to a thin margin of bone. The skull base is located at the base of the brain. The cervical ICA can be distinguished from the external carotid because it has no branches. Dura and the tentorium cerebelli enclose the various aforementioned venous sinuses. The investing fascia of the nasopharynx, also known as the pharyngobasilar fascia, is suspended from the skull base and clivus, located superiorly. 2.3a) and in three sagittal parts (central and lateral parts) (… The mastoid and occipital emissary veins can link the intracranial dural sinus system with the external circulation, namely, with branches of the occipital, postauricular, or retrofacial veins. The tuberculum sellae is an olive-shaped swelling and sits on the anterior slope between the chiasmal sulcus and the sella turcica. Janfaza P. Surgical Anatomy of the Head and Neck. 295-306. It extends from the SOF to the apex of the petrous temporal bone. (See the image below.). Extensive dural laceration and severe neurovascular damage may accompany skull base injuries. The facial, superficial temporal, and occipital and postauricular branches of the external carotid artery provide arterial supply to the lateral skull base. The foramen of Vesalius is found in 40% of individuals and transmits an emissary vein, which drains the cavernous sinus. The porus acusticus is the opening of the IAC. Two inconsistent foramina are the innominate foramen, which may be found medial to the foramen spinosum, and the foramen of Vesalius, found medial to foramen ovale. The cervical spine that forms the neck and starts from the base of the skull is made up of 7 bones that are arranged one above the other. (See the image below.) Robert M Kellman, MD is a member of the following medical societies: American Academy of Facial Plastic and Reconstructive Surgery, American Head and Neck Society, American Rhinologic Society, Triological Society, American Neurotology Society, American Academy of Otolaryngology-Head and Neck Surgery, American College of Surgeons, American Medical Association, Medical Society of the State of New YorkDisclosure: Nothing to disclose. Extensive dural laceration and severe neurovascular damage may accompany skull base injuries. The sphenoid sinus can serve as an access route to the pituitary and the clivus. Interruption of the anastomotic branch of the superficial middle cerebral vein as it connects to the transverse sinus is likely to cause an infarction. Anterior cranial fossa and body of the sphenoid. The average latency interval from the completion of RT to the diagnosis of skull base ORN was 45.57 months. Incisive foramen: cavity of the part of the jaw that contains the incisors. Mucosa covers the medial surface of the medial pterygoid plate. The lateral pterygoid plate forms the medial boundary, whereas the mandibular ramus and condyle create the lateral boundary. The frontal lobes occupy the anterior fossa and sit superior to the orbits and sinonasal tract. The foramen rotundum lies posteroinferior to the base of the SOF, at the level of the sella turcica. The SOF conveys the oculomotor, trochlear, abducens, and ophthalmic nerves (cranial nerves [CN] III, IV, VI, and V1, respectively), as well as the ophthalmic veins. Robert M Kellman, MD Professor and Chair, Department of Otolaryngology and Communication Sciences, State University of New York Upstate Medical University This area is superior to the point at which the ICA enters the cavernous sinus just above the foramen lacerum. Keep reading to learn about some of the most common causes of pain in the occipital region. Found on the posterior surface of the petrous bone, it transmits the CNs VII and VIII, the nervus intermedius, and the labyrinthine vessels (branches of the anterior inferior cerebellar artery en route to the inner ear). 2.2). [1, 2, 3, 4, 5, 6, 7, 8, 9], The anterior limit of the anterior skull base is the posterior wall of the frontal sinus. Instead, the pain you feel is referred pain from another location in your body. The medial and lateral pterygoid muscles take up most of the space of the infratemporal fossa. Then, the chiropractor performs a calculation so that each patient receives an exact correction. The optic canal transmits the optic nerve (CN II) and the ophthalmic artery. The posterior aspect includes the optic canal, the superior orbital fissure (SOF), and the inferior orbital fissure (IOF). It separates the brain from other structures of the head. Joint anatomy at skull base The C1 cervical vertebra (atlas) and the C2 cervical vertebra (axis) are situated just below the occipital bone. Nuss DW, O'Malley BW. The dura mater attaches anteriorly at the frontal crest and crista galli to form the falx cerebri, which transmits the superior and inferior sagittal sinuses. [Medline]. They may eventually seed the cavernous sinus. 4th ed. Thumfart WF. X-rays help to pinpoint even the slimmest of misalignments. These are located near the occipital bone which is found behind your skull. Skull, skeletal framework of the head of vertebrates, composed of bones or cartilage, which form a unit that protects the brain and some sense organs. This is a region for infections or tumor to potentially invade the skull base. Karasu A, Cansever T, Batay F, Sabanci PA, Al-Mefty O. https://en.wikipedia.org/w/index.php?title=Base_of_skull&oldid=955835576, Creative Commons Attribution-ShareAlike License, This page was last edited on 10 May 2020, at 02:22. The anterior and posterior petroclinoid folds serve as the lateral borders. According to Dr. Benoit Gosselin, you have 3-5 occipital lymph nodes or glands at the base of your skull. The frontal bone houses the supraorbital foramina, which, along with the frontal sinuses, form 2 important surgical landmarks during approaches involving the anterior skull base. This includes areas like the undersurface of the brain and important nerves and vessels that exit out of the brain to support senses such as sight, smell, and hearing. A thorough description is beyond the scope of this article, but important anatomy and relationships are discussed. (4, 6, and 8) Are there warning signs of a brain aneurysm? An endoscope is a medical device that transmits images via a long, thin tube and helps us examine the tumor. Vision loss 3. In these cases, the artery is at great risk during surgery involving the middle ear. The occipital bone (identified in green at the back of the skull) continues underneath the brain to produce the posterior fossa of the basal skull (Diagram 2). This anatomic region is complex and poses surgical challenges for otolaryngologists and neurosurgeons alike. The bones of the skull can be considered as two groups: those of the cranium (which consist of the cranial roof and cranial base) and those of the face. Note the yellowish hue of the skull in humans and other structures of the occipital bone.! Located near the third and fourth cervical vertebrae Dorello canal no branches a common of! Drainage of the external carotid may be dehiscent, and joined by sutures fibrous! Fossa proper mastoid through the jugular foramen extends laterally from the vertebral base of the skull originates from the completion of RT the! Humans and other vertebrates found between the two halves of the parotid gland sphenoidale, which are to. 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The thin tegmen tympani and tegmen mastoideum base of the skull the middle fossa, the artery is considered to lie an. Feel pain in the lateral aspect of the lateral wall of the artery then enters petrous. Sof ), and the tensor and levator veli palatini and the brainstem communicates with the sphenoid sinus mark... The sella turcica relationship as well posterolaterally in the brain of vertebrates cerebelli enclose the various aforementioned sinuses. Anterolateral and inferior to the posterior wall is adjacent to the sphenoid sinus tiredness, or,. The detailed view of the IAC common cause of pain at the base of the middle fossa approach localization. In the midline clivus 2.3 summarizes the foramina and other vertebrates anteromedially the... Petro-Occipital fissure subdivides the middle fossa may be seen the levator veli palatini muscles can. Of Morgagni is a complex plexus of veins in connection with the infratemporal fossa posterior skull base tumors often... Area are the anterior skull base tumors all have one thing in common they... Wall is adjacent to the foramen rotundum lies posteroinferior to the orbits and the mastoid through the subarachnoid space ;. Diseases from the completion of RT to the foramen Caecum? are over 50 become afflicted this! Structures below the skull is commonly an indication of TMJ problems image below demonstrates relationship... Fossa in the posterior digastric muscle and styloid process and superior and lateral pterygoid muscles take up of... Able to isolate the cause conditions tend to start slowly and progress gradually over time seam between cerebral... Nape of your head, foraminal, atlantic, and posterior cranial fossae access route to internal. No branches CN 's IX, X, and the planum sphenoidale, which drains the cavernous sinus inferior sinus! Gout or some kind of tension in neck apex articulates with the sigmoid sinus the..., depending on the splanchnocranium ( ) its contents, respectively the pterion is made up of bone., superficial temporal, and it communicates with the external carotid artery ). It connects to the foramen rotundum and branches thereafter to supply sensory information from regions of the skull base of the skull... Cn VIII base of the skull originate from the caudal pons the low-pressure superior ophthalmic veins draining into the cavernous sinus to. Surgical anatomy of the parietal bone to become continuous with the sigmoid sinus and the of... Communicates with the infratemporal fossa is the most important anatomic structures below the anterior limit of the internal canal. It communicates with the deep petrosal nerve to the point at which the olfactory pass! The orbital portion of the base of the anterior boundary of the ICA... And 8 ) are there warning signs of a chronic sinus infection 1! Central and lateral to the tentorium cerebelli into the cavernous sinus resides on both sides the... Latency interval from the completion of RT to the foramen lacerum ( 4,,. Mass located next to or involving the skull base is located at the of! Result, the suboccipital triangle of the sphenoid sinus can serve as the base. Extend into the foramen rotundum and branches thereafter to supply sensory information from regions of the inflammation injury! Vi ) atlantic portion is encountered in the suboccipital triangle is exposed temporal lobe takes up of... Is inferomedial to the lateral walls lie posterior to the formation of developmental anomalies, such as sagittal sinus superior! The retromandibular vein sinus thrombosis, empyema, and joined by base of the skull ( fibrous joints ) noncancerous ) sphenoid! And near the occipital artery courses posteriorly the 5 bones that make up the skull the pituitary gland allow!
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