Skull and Cranial Cavity

Question 1

what is in between 2 layers of compact bone of the skull?

Answer 1

spongy bone: Diploe

Question 2

3 major sutures:

Answer 2

coronal
sagittal
lambdoid

Question 3

pterion is H-shaped fusion of?

Answer 3

frontal
sphenoid (greater wing)
parietal
temporal

Question 4

Why is injury to pterion dangerous? 2 reasons

Answer 4

thin area

middle meningeal artery grooves under it

Question 5

what demarcates vertical to horizontal transition of frontal bone?

Answer 5

supraorbital margin

Question 6

4 projections of the temporal bone are:

Answer 6

1. zygomatic process
2. mastoid process
3. styloid
4. petrous: into cranium (pyramid shaped)

Question 7

where does the pituitary sit?

Answer 7

sella turcica of the sphenoid

Question 8

2 structures of ethymoid bone that project into skull?

Answer 8

crista galli

cribiform plate

Question 9

superior orbital fissure divides?

Answer 9

greater and lesser wings of sphenoid

Question 10

Anterior cranial fossa holds?

Answer 10

frontal lobe

lesser wings of sphenoid

Question 11

middle cranial fossa holds?

Answer 11

temporal lobes
greater wings of sphenoid
petrous part of temporal bone

Question 12

posterior fossa holds?

Answer 12

cerebellum

occipital lobe

Question 13

olfactory nerve goes through what?

Answer 13

cribiform plate

Question 14

what’s in the optic canal?

Answer 14

optic nerve

ophthalmic artery

Question 15

what goes through cribiform late?

Answer 15

olfactory nerve

Question 16

what foramen has the optic nerve

ophthalmic artery?

Answer 16

optic canal

Question 17

what contains nerves to extraocular muscles and branches of trigeminal nerve?

Answer 17

superior orbital fissure

Question 18

maxillary nerve goes through what?

Answer 18

foramen rotundum

Question 19

foramen rotundum structure?

Answer 19

maxillary nerve

Question 20

superior orbital fissure contains?

Answer 20

nerves to extraocular muscles and branches of trigeminal nerve

Question 21

what goes through foramen spinosum?

Answer 21

middle meningeal artery

Question 22

what goes through foramen ovale?

Answer 22

mandibular nerve

Question 23

middle meningeal artery foramen?

Answer 23

foramen spinosum

Question 24

mandibular nerve foreamen?

Answer 24

foramen ovale

Question 25

internal acoustic meatus has what?

Answer 25

facial

vestibulocochlear nerve

Question 26

Jugular foramen has? 4 things

Answer 26

IX,X,XI internal jugular vein

Question 27

facial

vestibulocochlear nerve goes through?

Answer 27

internal acoustic meatus

Question 28

IX,X,XI goes through?

Answer 28

jugular foramen

also the internal jugular vein

Question 29

what goes through foramen lacerum?

Answer 29

NOTHING!

Question 30

hypoglossal canal?

Answer 30

hypoglossal nerve

Question 31

epidural and subdural space real?

Answer 31

only potential space

Question 32

purpose of falx and tentorium?

Answer 32

restrict rotation of brain

Question 33

falx cerebri attachments?

Answer 33

front: crista galli
back: interior of external occipital protuberance

Question 34

what is falx cerebelli?

Answer 34

beneath tentorium midline of cerebellum

Question 35

what is diaphragma sellae?

Answer 35

roof of sella turcica, covers pituitary

Question 36

3 places sinuses drain venous blood

Answer 36

brain
diploe
emissary veins (bad for infection risk on scalp)

Question 37

trace path of inferior saggital sinus

Answer 37

tracts backwards, joint great cerebral vein, forms straight sinus, joins confluence of sinuses

Question 38

what is the intercavernous sinus for?

Answer 38

pituitary

other important optic structures

Question 39

what happens after the confluence of sinuses?

Answer 39

transverse sinus along tentorium horizontally, then sigmoid sinus to internal jugular

Question 40

when does sigmoid sinus start?

Answer 40

where tentorium meets petrous part of temporal bone at edge of middle cranial fossa

Question 41

middle meningeal artery is branch of?

Answer 41

maxillary artery

Question 42

middle meningeal artery formed where?

Answer 42

outside skill

Question 43

middle meningeal artery enters through?

Answer 43

foramen spinosum

Question 44

middle meningeal artery does what after enters the skull?

Answer 44

split into ant/post and grooves the bone