Basicranium Flashcards
functions of basicranium
protect important soft tissue structures and connect head to body; endochondral bones
sphenoid
face hangs off it (good bone to know stuff about; its her fave)
pterygoid processes
four pieces (2 on each side) that hand off the bottom of the sphenoid
optic foramen (canal)
hole on lesser wings lateral to sphenoidal sinus
lateral pterygoid muscle
attaches to lateral surface of lateral pterygoid plate (responsible for lateral deviation of mandible)
medial pterygoid muscle
pterygoid fossa between 2 plates; responsible for elevation of the mandible
sella turcica
looks saddle like from superior view; pituitary gland sits inside
optic foramen
see diagram; optic nerve travels through it
spheno-occipital synchondrosis
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
basicranial flexion
angle between foramen magnum and optic canals is slightly obtuse in modern people but is variable in hominin evoluiton
presphenoid
consists of lesser wings, body anterior to sella turcica and has 6 total ossification centers
post sphenoid
has sella turcica, ptergoid plates and greater wings with 8 ossification centers total
devel of spheniod
presphenoid and postshenoid fused after birth
temporal
also in the basicranium
ethmoid
more centrally located in the face than the sphenoid
-midline bone
connects brain to the nasal cavity
crista galli
portion of the ethmoid; most superior portion; connects to brain; anchors falx cerebri
orbital plate
there are 2 in ethmoid and they help to form optic capsule
nasal conchae (superior and middle)
spiral a bit to make air pockets
cribiform plate
plate of the ethmoid that can be seen on the median plane
falx celebri
contains superior sagittal sinus
divides two cerebral hemispheres
helps cushion brain in space
