Basicranium

Question 1

functions of basicranium

Answer 1

protect important soft tissue structures and connect head to body; endochondral bones

Question 2

sphenoid

Answer 2

face hangs off it (good bone to know stuff about; its her fave)

Question 3

pterygoid processes

Answer 3

four pieces (2 on each side) that hand off the bottom of the sphenoid

Question 4

optic foramen (canal)

Answer 4

hole on lesser wings lateral to sphenoidal sinus

Question 5

lateral pterygoid muscle

Answer 5

attaches to lateral surface of lateral pterygoid plate (responsible for lateral deviation of mandible)

Question 6

medial pterygoid muscle

Answer 6

pterygoid fossa between 2 plates; responsible for elevation of the mandible

Question 7

sella turcica

Answer 7

looks saddle like from superior view; pituitary gland sits inside

Question 8

optic foramen

Answer 8

see diagram; optic nerve travels through it

Question 9

spheno-occipital synchondrosis

Answer 9

name of special suture at which sphenoid and occipital bones articulate (doesn’t fuse til adolecence)
allows angle between face and basicranium to be altered through evolution

Question 10

basicranial flexion

Answer 10

angle between foramen magnum and optic canals is slightly obtuse in modern people but is variable in hominin evoluiton

Question 11

presphenoid

Answer 11

consists of lesser wings, body anterior to sella turcica and has 6 total ossification centers

Question 12

post sphenoid

Answer 12

has sella turcica, ptergoid plates and greater wings with 8 ossification centers total

Question 13

devel of spheniod

Answer 13

presphenoid and postshenoid fused after birth

Question 14

temporal

Answer 14

also in the basicranium

Question 15

ethmoid

Answer 15

more centrally located in the face than the sphenoid
-midline bone
connects brain to the nasal cavity

Question 16

crista galli

Answer 16

portion of the ethmoid; most superior portion; connects to brain; anchors falx cerebri

Question 17

orbital plate

Answer 17

there are 2 in ethmoid and they help to form optic capsule

Question 18

nasal conchae (superior and middle)

Answer 18

spiral a bit to make air pockets

Question 19

cribiform plate

Answer 19

plate of the ethmoid that can be seen on the median plane

Question 20

falx celebri

Answer 20

contains superior sagittal sinus
divides two cerebral hemispheres
helps cushion brain in space