Flashcards in Interior skull Deck (66):
Main aspects of the cranial cavity
Roof and bowl-shaped floor
What makes up the roof of the cranial cavity?
What forms the anterior portion of the roof of the cranial cavity?
What formfs the niddle part of theroof of the cranial cavity?
What forms the posterior part of the roof of the cranial cavity?
Attachment point for falx cerebri on the frontal bone
frontal crest that is midline on the frontal bone
Where does the frontal crest terminate?
Begininning of the groove for the superior saggital sinus
What are the small pits and depressions in the calvaria that host the arachoid granulaitons?
Shallowest/most superior cranial fossa
Anterior cranial fossa
Attachment point for the falx cerebri on the ethmoid bone
Passage for nasal emissary veins
Passage for axons of olfacotry nerves
Passage for ethmoid artery and vein
Anterior/posterior ethmoidal foramina
Bones of the middle cranial fossa
Central upper part of the sphenoid body
Anterior boundary of the chiasmatic sulcus
Limbus of sphenoid
Where do the optic nerves cross?
Processes that surround the sella turcica
Anterior/posterior clinoid processes
Elevation at the posterior aspect of the chiasmatic sulus
Depression housing the pituitary gland
Bony ridge projecting superior with posterior clinoid processes as lateral edges
Bone that contains grooves for middle meningeal artery
Contains vestibulocochelar apparatus
Forms the optic canal
Lesser wing of sphenoid
Runs through optic canal
CN2 and ophthalmic artery
Opening between the greater and lesser wings of sphenoid
Superior orbital fissure
Vessels running thru the superior orbital fissure
CN 3, 4, 5, 6 and ophthalmic veins
Opening posterior of medial end of superior orbital fissure
Where does the foramen rotundum open to?
Vessels thru foramen rotundum
Maxillary nerve of trigeminal
Where does the foramen ovale open to?
Vessels thru foramen ovale
Mandibular division of trigeminal nerve, lesser petrosal nerve, accessory meningeal artery
Where does the foramen spinosum open into?
Opening in cranium posteromedial to f. ovale
Contents of carotid canal
ICA and nerve plexus
Opening posteriolateral to hypophyseal fossa
F. Lacerum, partially filled with cartilage
Largest, deepest, and most inferior cranial fossae
Posterior cranial fossa
Shallow depression behind the dorsum sella that slopes posteriorly
Midline from F. magnum posteriorly to internal occupital protuberance
Internal occipital crest
Depressions separated by internal occipital crest
Deep cerebellar fossae
Largest foramen of skull
Contents of f. magnum
Bratinstem/spinal cord and meninges, vertebral arteries, CN 11
Opening at the base of petrous ridge of temporal bone
Contents of jugular foramen
CN 9, 10, 11, sigmoid sinus (into the superior bulb of IJV)
Anteriosuperior opening to jugular f. within the petrous portion
Internal Acoustic Meatus
Contents of internal acostic meatus
CN 7, 8, labyrinthine artery
Opening anteriolateral to F. magnum
Sinus lateral to clivus
interfior petrosal sinus
Sinus between temporal/occipital bones
Sinus from internal occipital protuberance to the sigmoid sinus
Layers of Cranial dura mater
Periosteal layer, membranous layer
Which cranial meningeal layer is not continuous with the spinal meninges?
What produces the CSF in the subarachnoid space of the brain?
Choroid plexuses in brain ventricles
Where is CSF reabsorbed in the brain?
Arachnoid granulations in superior sagittal sinus
Portion of inner membranous layer of dura mater that helps to partition and support structures in cranium
Large, sickle-shaped dural infolding that passes between 3 cerebral hemispheres
Separates cerebellum from inferior portion of cerebrum
Endothium-lined space between 3 dural layers
Dural venous sinuses
Dilated region near the internal occipital protuberance where several dural sinuses meet
Confluence of sinuses
Nerve that supplies the anterior cranial fossa
Nerve that supplies the tentorium cerebelli
CN V1 and 2
Nerve that supplies the middle cranial fossa
CN V2 and 3
Nerve that supplies the posterior cranial fossa
Upper cervical nerves and CN 10
Between calvaria and periosteal layer of dura. Typicall meningeal artery rupture due to calvaria Fx. Shows up like a lens shaped hematoma due to dura's attachments to sutures
Between meningeal layer of dura and arachnoid layer. Typically venous ruptue. Leads to cresent shape. Acute vs chronic