Term
| What are the three distinct divisions of the cranial cavity? |
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Definition
| Anterior, middle, and posterior cranial fossas |
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Term
| What bones make up the anterior cranial fossa? |
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Definition
| Frontal, ethmoid, and sphenoid |
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Term
| What portion of the ethmoid bone provides a point of attachment for the falx cerebri? |
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Definition
| Crista galli segment of the cribiform plate |
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Term
| What makes up the posterior border of the anterior cranial fossa? |
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Definition
| Lesser wing of the sphenoid bone and the sphenoid limbus (body of the sphenoid) |
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Term
| What part of the sphenoid limbus is considered part of both the anterior and middle cranial fossa? |
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Definition
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Term
| What part of the sphenoid provides an attachment point for the free edge of the tentorium cerebelli? |
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Definition
| Anterior clinoid process located at the medial end of the lesser wing of the sphenoid |
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Term
| What foramina are found in the anterior cranial fossa? |
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Definition
| Foramen cecum, anterior enthmoid foramen, foramina of the cribiform plate, posterior ethmoid foramen |
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Term
| Where is the foramen cecum located? |
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Definition
| Between crista gali and frontal crest |
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Term
| Where is the anterior ethmoidal foramen located? |
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Definition
| Midway along the frontoethmoid suture |
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Term
| Where is the foramina of the cribiform plate located? |
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Definition
| As small fenestrae of the cribiform plate |
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Term
| The anterior ethmoidal foramen provides a passage for what? |
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Definition
| Anterior ethmoidal nerve and vessels which descend into the nasal cavity |
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Term
| The foramina of the cribiform plate provides passage for what? |
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Definition
| Olfactory nerve fibers between the olfactory mucosa and the olfactory bulbs |
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Term
| The posterior ethmoidal foramen provides a passage for what? |
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Definition
| Posterior ethmoidal vessels to the nasal cavity |
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Term
| What lobes of the brain are associated with the anterior cranial fossa? |
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Definition
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Term
| What accommodates the olfactory bulbs within the anterior cranial fossa? |
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Definition
| Cribiform plate of the ethmoid bone |
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Term
| What bones makes up the middle cranial fossa? |
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Definition
| Sphenoid, temporal, and parietal bones |
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Term
| The midline passage of the middle cranial fossa is known as what? |
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Definition
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Term
| What fossa is found within the sella turcica? |
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Definition
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Term
| What are the boundaries of the hypohyseal fossa? |
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Definition
| Tuberculum sellae anteriorly and dorsum sellae posteriorly |
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Term
| What makes the path on either side of the sella turcica for the passage of the internal carotid artery through the cavernous sinus? |
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Definition
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Term
| What are all the foramina of the middle cranial fossa? |
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Definition
| Optic canal, superior orbital fissure, foramen rotundum, foramen ovale, foramen spinosum, foramen lacerum, hiatus of greater petrosal nerve, hiatus of lesser petrosal nerve |
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Term
| Where is the optic canal located and what does it transmit? |
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Definition
| Chiasmatic groove of the middle cranial fossa, transmits the optic nerve and opthalmic artery |
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Term
| Where is the superior orbital fissure located? |
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Definition
| Located anteriorly between the wings and body of the sphenoid in the middle cranial fossa |
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Term
| What is transmitted through the superior orbital fissure |
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Definition
| CN III, IV, VI, branches of V, sympathetic fibers, superior/inferior opthalmic veins, orbital branch of the middle meningeal artery, and the recurrent branch of the lacrimal artery |
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Term
| Where is the foramen rotundum located? |
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Definition
| Behind the medial end of the superior orbital fissure in the greater wing of the sphenoid |
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Term
| What is contained within the foramen rotundum |
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Definition
| Maxillary division of the trigeminal nerve |
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Term
| Where is the foramen ovale found? |
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Definition
| Behind and lateral to the foramen rotundum in the greater wing of the sphenoid within the middle cranial fossa |
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Term
| What is found within the foramen ovale? |
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Definition
| Mandibular division of the trigeminal nerve, lesser petrosal nerve, and accessory meningel artery |
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Term
| Where is the foramen spinosum located? |
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Definition
| Posterolateral to the foramen oval in the greater wing of the sphenoid in the middle cranial fossa |
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Term
| What does the foramen spinosum transmit? |
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Definition
| Middle meningeal artery and vein and the meningeal branch of the mandibular nerve |
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Term
| Where is the foramen lacerum located? |
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Definition
| As a ragged opening at the posterior end of the carotid groove |
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Term
| What travels through the foramen lacerum? |
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Definition
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Term
| The foramen lacerum contains an opening to what in its anterior wall? |
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Definition
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Term
| What is the function of the trigeminal depression? |
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Definition
| Accomodates the trigeminal ganglion within the middle cranial fossa behind the foramen lacerum |
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Term
| What is the function of the tegemen tympani? |
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Definition
| Located within the middle cranial fossa as a thin osseous plate that forms the anterior surface of the petrous temporal bone within the cranial cavity and acts as the roof of the tympanic cavity and mastoid antrum |
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Term
| Which lobes of the brain are held within the middle cranial fossa? |
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Definition
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Term
| What reflection of the meningeal dura in combination with the bony hyophyseal fossa of the middle cranial fossa encapsulates the pituitary gland? |
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Definition
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Term
| What bones form the posterior cranial fossa? |
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Definition
| Sphenoid, occipital, temporal |
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Term
| What forms the posterior border of the posterior cranial fossa? |
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Definition
| Groove for the transversus sinus and the midline internal occipital protuberance |
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Term
| The internal occipital crest descending from the internal occipital protuberance provides an attachment site for what? |
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Definition
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Term
| Where is the jugular foramen located? |
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Definition
| At the posterior end of the petro-occipital fissure within the posterior cranial fossa |
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Term
| What is found within the jugular foramen? |
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Definition
| CN IX, X (and its meningeal branch), XI, the inferior petrosal sinus, internal jugular vein, meningeal branch of the occipital artery |
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Term
| Where is the internal acoustic meatus found? |
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Definition
| Above the jugular foramen in the posterior cranial fossa |
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Term
| What is found within the internal acoustic meatus? |
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Definition
| CN VII, VIII, and the labyrinthine artery |
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Term
| Where is the hypoglossal canal located? |
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Definition
| Medial and inferior to the jugular foramen within the posterior cranial fossa |
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Term
| What is contained within the hypoglossal canal? |
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Definition
| CN XII and its meningeal branches, and the meningeal branch of the ascending pharyngeal artery |
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Term
| What passes through the foramen magnum on the floor of the posterior cranial fossa? |
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Definition
| Accessory nerves (CN XI), anterior and posterior spinal artery, vertebral arteries, and is the site of junction between the spinal cord and the medulla oblongata |
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Term
| What part of the brain is found within the posterior cranial fossa? |
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Definition
| The cerebellum cradled by the cerebellar fossa, and the pons and medulla within the clivus |
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Term
| What forms the tentorial notch? |
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Definition
| Anterior concave free edge of the tentorium cerebelli |
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Term
| Where is the oculomotor nerve susceptible to injury with increased intracranial pressure? |
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Definition
| As it exits the midbrain and travesl anteriorly to the enter the anterior edge of the tentorium cerebelli |
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