Flashcards in Skull and Cranial Cavity Deck (44):
what is in between 2 layers of compact bone of the skull?
spongy bone: Diploe
3 major sutures:
pterion is H-shaped fusion of?
sphenoid (greater wing)
Why is injury to pterion dangerous? 2 reasons
middle meningeal artery grooves under it
what demarcates vertical to horizontal transition of frontal bone?
4 projections of the temporal bone are:
1. zygomatic process
2. mastoid process
4. petrous: into cranium (pyramid shaped)
where does the pituitary sit?
sella turcica of the sphenoid
2 structures of ethymoid bone that project into skull?
superior orbital fissure divides?
greater and lesser wings of sphenoid
Anterior cranial fossa holds?
lesser wings of sphenoid
middle cranial fossa holds?
greater wings of sphenoid
petrous part of temporal bone
posterior fossa holds?
olfactory nerve goes through what?
what's in the optic canal?
what goes through cribiform late?
what foramen has the optic nerve
what contains nerves to extraocular muscles and branches of trigeminal nerve?
superior orbital fissure
maxillary nerve goes through what?
foramen rotundum structure?
superior orbital fissure contains?
nerves to extraocular muscles and branches of trigeminal nerve
what goes through foramen spinosum?
middle meningeal artery
what goes through foramen ovale?
middle meningeal artery foramen?
mandibular nerve foreamen?
internal acoustic meatus has what?
Jugular foramen has? 4 things
IX,X,XI internal jugular vein
vestibulocochlear nerve goes through?
internal acoustic meatus
IX,X,XI goes through?
also the internal jugular vein
what goes through foramen lacerum?
epidural and subdural space real?
only potential space
purpose of falx and tentorium?
restrict rotation of brain
falx cerebri attachments?
front: crista galli
back: interior of external occipital protuberance
what is falx cerebelli?
beneath tentorium midline of cerebellum
what is diaphragma sellae?
roof of sella turcica, covers pituitary
3 places sinuses drain venous blood
emissary veins (bad for infection risk on scalp)
trace path of inferior saggital sinus
tracts backwards, joint great cerebral vein, forms straight sinus, joins confluence of sinuses
what is the intercavernous sinus for?
other important optic structures
what happens after the confluence of sinuses?
transverse sinus along tentorium horizontally, then sigmoid sinus to internal jugular
when does sigmoid sinus start?
where tentorium meets petrous part of temporal bone at edge of middle cranial fossa
middle meningeal artery is branch of?
middle meningeal artery formed where?
middle meningeal artery enters through?