Neurocranium and Basicranium Part 2

Question 1

Occipital bone forms posterior _________ and part of _______ of cranium

Answer 1

neurocranium ; base

Question 2

Until 3 4 years of age,
occipital bone consists of
4 pieces:

Answer 2

Squamous, 2 lateral, and basilar part

Question 3

inion is more prominent in ____

Answer 3

males

Question 4

what divides the squama into the occipital planum and nuchal planum

Answer 4

superior nuchal line

Question 5

true or false; nuchal planum is rougher than occipital planum

Answer 5

true

Question 6

extends inferiorly
from the inion to the
foramen magnum

Answer 6

external occipital crest

Question 7

superior fossa bone is _____ and inferior fossa bone is

Answer 7

thick; thin

Question 8

The junction between the basilar and lateral (condylar) elements of the occiput is delineated by the

Answer 8

hypoglossal canal

Question 9

transmits emissary vein

Answer 9

condylar foraminae at base of occiput

Question 10

clivus

Answer 10

endocranial surface of basilar portion of occipital

Question 11

The sphenoid bone (shown in black) extends across
the skull base and is a transitional bone between the
bones of the ______ and of the ______.

Answer 11

face; calvarium

Question 12

sphenoid bone components

Answer 12

• body
• 2 lesser wings
• 2 greater wings
• 2 pterygoid processes

Question 13

Triangular lesser wing of each side has free
concave posterior border (lateral concave
crest) ending medially in __

Answer 13

anterior clinoid

process

Question 14

Internal carotid artery enters cranial cavity via ______

Answer 14

foramen lacerum

Question 15

V shaped sphenoid rostrum fits into similar V shaped groove between ________

Answer 15

alae of vomer

Question 16

Sphenoidal crest articulates with posterior aspect of _________

Answer 16

vertical plate of ethmoid

Question 17

true or false; Infratemporal crest is at junction of vertical and horizontal parts of greater sphenoid wing

Answer 17

true

Question 18

are two posterior oblong openings defined by
sphenoid body, medial pterygoid laminae, and
palatine horizontal processes, and separated by vomer

Answer 18

left and right choanae

Question 19

origin of sphenomandibular ligament

Answer 19

sphenoidal spine

Question 20

true or false: the inferior nuchal line extends bilaterally from the inion

Answer 20

false; the superior nuchal line extends bilaterally from the inion

Question 21

the _____ ______ ______ extends inferiorly from the inion to the foramen magnum

Answer 21

external occipital crest

Question 22

what is at the centre of the cruciform eminence of the occipital?

Answer 22

the internal occipital protuberance

Question 23

in the endocranial surface of the occipital, the superior fossae and inferior fossae is divided by the ______ _______

Answer 23

cruciform eminence

Question 24

the 2 superior fossae of the occipital bone is for the _____ lobes and the 2 inferior fossa of the occipital bone is for the _____ lobes

Answer 24

occipital; cerebellar

Question 25

at the centre of cruciform is internal occipital protuberance, which the _____ _______ _____ descends. This divides inferiorly to form the _____ fossa

Answer 25

internal occipital crest; vermian

Question 26

occipital condyles are _____ convergent

Answer 26

anteriorly

Question 27

the _____ _____ overhangs the hypoglossal canal

Answer 27

jugular tubercle

Question 28

the atlanto-occipital joint is a ____ _____ joint

Answer 28

synovial ellipsoid

Question 29

true or false; the condylar fossa is a depression anterior to occipital condyle

Answer 29

false; the condylar fossa is a depression posterior to the occipital condyle

Question 30

the ____ ______ may be found at the base of the condylar fossae - transmit an _____ vein

Answer 30

condylar foraminae ; emissary

Question 31

the basilar part of the occipital extends anteriorly and superiorly from the foramen magnum towards the sphenoid at the _____ _____ or the spheno-occipital synchondrosis

Answer 31

basilar suture

Question 32

along each side of the basilar portion of the occipital is half of a sulcus for the _____ _____ _____

Answer 32

inferior petrosal sinus

Question 33

rugosities are roughened bony mm markings for the mm. These are on the _____ _____

Answer 33

nuchal planum

Question 34

______ is a transitional bone from the face and the calvarium

Answer 34

sphenoid

Question 35

triangular lesser wing of each side has free concave posterior border ending medially in ____ _____ _____

Answer 35

anterior clinoid process

Question 36

medial end of lesser wing divides anterior and posterior roots where it attaches to body of sphenoid, and forms _____ ______

Answer 36

optic canal

Question 37

true or false; both the carotid canal and pterygoid canal empty into the foramen lacerum

Answer 37

true

Question 38

internal carotid artery enters cranial cavity via ____ _____

Answer 38

foramen lacerum

Question 39

internal carotid artery produces ____ _____ on sphenoid body from foramen lacerum to anterior clinoid process

Answer 39

carotid groove

Question 40

vertical triangular area at either side of sphenoidal crest forms part of roof of nasal cavity; near midpoint is _____ or _____ of sphenoidal air sinus

Answer 40

orifice; ostium

Question 41

true or false; the lesser wing forms the anterior part of lateral subdivision of middle cranial fossa

Answer 41

false; it is the greater wing that forms anterior part of lateral subdivision of middle cranial fossa

Question 42

the greater wing of the sphenoid is separated from the lesser wing of the sphenoid via the _____ _____ _____

Answer 42

superior orbital fissure

Question 43

sphenoid greater wing contributes to anterior portion of ____ fossa and part of ____ fossa

Answer 43

temporal ; infratemporal

Question 44

____ _____ is at junction of vertical and horizontal parts of greater sphenoid wing

Answer 44

infratemporal crest

Question 45

pterygoid process divides into _____ and _____ pterygoid laminae

Answer 45

medial; lateral

Question 46

the infratemporal fossae and temporal fossa are separated by ___ ______

Answer 46

infratemporal crest