Osteology: Cranial Fossae

Question 1

anterior cranial fossa

Answer 1

frontal bone
ethmoid bone
lesser wing of sphenoid

Question 2

middle cranial fossa

Answer 2

greater wing of sphenoid
orbital canals, etc.
petrous portion of temporal bone
parietal bone?

Question 3

posterior cranial fossa

Answer 3

internal auditory meatus, etc.
occipital bone
partietal bone?

Question 4

foramen cecum

Answer 4

in the frontal bone!
articulates with the ethmoid bone
emissary v. travels though

Question 5

crista galli

Answer 5

attachment of falx cerebri

point in ethmoid bone

Question 6

cribiform plate

Answer 6

holes in ethmoid bone
CN I olfactory
anterior ethmoid n, a, v

Question 7

lesser wing of sphenoid bone

Answer 7

the pointy part; the border of the anterior cranial fossa

Question 8

greater wing of sphenoid bone

Answer 8

where all the holes are in the middle cranial fossa

Question 9

superior orbital fissure

Answer 9

CN III, IV, V1, VI and opthalmic vv travel though

Question 10

optic canal

Answer 10

CN II and opthalmic a. travel though

Question 11

chiasmatic groove

Answer 11

where optic chiasm occures

Question 12

sella turcica

Answer 12

holds pituitary gland (diaphragma sellae covers it)

Question 13

ant, middle, posterior clinoid processes

Answer 13

attachment of tintorium cerebelli

Question 14

foramen rotundum

Answer 14

V2 travels through

Question 15

foramen ovale

Answer 15

V3 travels through

Question 16

foramen spinosum

Answer 16

middle meningeal a., recurrent meningeal br. of V3 (?)

Question 17

foramen lacerum

Answer 17

closed by cartilage in life

greater petrosal nerve crosses over it

Question 18

carotid groove

Answer 18

for internal carotid groove in cavernous sinus

Question 19

hiatus of facial canal

Answer 19

for greater petrosal nerve from CN 7

Question 20

petrous portion of temporal bone

Answer 20

the hard “rocky” part

Question 21

arcuate eminence

Answer 21

small bump in petrous portion of temporal bone caused by the arch of the superior semicircular canal of the ear

Question 22

internal auditory meatus

Answer 22

transmits CN 7, 8, and auditory branch of basilar artery

Question 23

jugular foramen

Answer 23

CN 9, 10, 11

Question 24

hypoglossal canal

Answer 24

CN 12

Question 25

foramen magnum

Answer 25

transmits spinal cord, CN 11, and vertebral a.

Question 26

internal occipital protuberance

Answer 26

site of confluens of sinuses