Skull part 3

Question 1

anterior cranial fossa floor is formed by ______, ___, and _____.

Answer 1

pars orbitalis of frontal bone, lesser wing of sphenoid, part of the ethmoid bone

Question 2

median concave crest is central portion of posterior borderer of _____ formed by 2 ______

Answer 2

jugum; lesser sphenoid wings

Question 3

a superior extension of the nasal septum is called the

Answer 3

crista galli

Question 4

the crista galli is part of the ____ bone

Answer 4

ethmoid

Question 5

which dural fold attaches to the crista galli?

Answer 5

falx cerebri

Question 6

the ____ is one of the 3 membranous layers that surround the brain and spinal cord

Answer 6

dura

Question 7

true or false; the cranial cavity is fully internally subdivided by four membranous folds of the dura mater

Answer 7

false; it is only partially subdivided by four membranous folds of the dura mater

Question 8

function of dural folds

Answer 8

prevents excessive brain movement within the cranium

Question 9

the ______ of the ethmoid is multiply - perforated in the anterior cranial fossa floor

Answer 9

cribriform plate of ethmoid

Question 10

the ___ forms the roof of the nasal cavity

Answer 10

cribriform plate

Question 11

the left and right _____ roofs the orbital cavity

Answer 11

orbital plates

Question 12

the orbital plates of frontal bone form the floor of _____ and roof of _______

Answer 12

anterior cranial fossa; each orbital cavity

Question 13

bony ridges corresponding to cerebral sulci are noted primarily in the _______ fossa

Answer 13

anterior cranial fossa

Question 14

this fossa is butterfly shaped

Answer 14

middle cranial fossa