skull Flashcards
how many bones are in the skull and for what it divided
the skull has 22 bones,8 for the braincase (neurocranium) and 14 facial bones
mention the bones that the cranial bones is divided for
1-frontal, sphenoid,ethmoid,occipital
2-pariatal ,temporal
bones of briancase devised to
1 cranial vault
2 cranial base
which bones the cranial vault contains
frontal /parietal/ greater wing of sphenoid
squamous of occipital and temporal
crinial base bones
orbital frontal/ethmoid/sphenoid/petrous temporaland basilar occipit
what is the joints for each:
cranial vault -
cranial base-
fibrous joints(collagen)
cartilaginous joints (stable butmoves abit)
synovial joints with fluid - freely movable
cranvault bones are?
diplor bones : the spongy cancellous bone separating the inner and outer layers of the cortical bone of the skull.
what is the sutuers in the cranial vault?
1 coronal suture
2 sagittal
3 limbdoid
what are the main points in cranial vault?
1 bregma -sag/coro
2 lambda -sag/limbd
3 vertex -top most point of cranium
4 pterion
what is the weakest point in the skull/why?
pterion (H shap sutures)
its the junction betwen four different bones
pteron in latin means wing
why pterion is very dangerous area?
under it is a very important blood vessal called middle meningeal artry which can lead to a hematoma
hematoma- blood accumilatting
cranial base (interion view) the floor of the brian box has two surfaces ?
1 internal surface -3 fossae -ant,mid,post
2 external surface -inferio raspect of the skull
anterior cranial fossa contains of :
1- orbital plats of frontal bone
2-lesser wing of sphenoid
3-cribtiform plate of eithmoid
cribtiform plate of eithmoid location
central,, roof of nasal cavity perforated for transmission of olf.ns
crista galli ;cocks comb
perforated;مثقب
what is crista galli ?
median projection form crib.ethmiod that provided attachments site for meninges
meninges three membranes layers that cover,protect brain spinal cord CNS
what are the foramina in ant.fossa:
1-foramen cacum
2-olfactory foramina
middle cranial fossa(butterfly shaped)
consit of :
1 sella turcica
2 depressed parts
3 sphenoid bone
4 sup.borders of temporal
sella turcica(sphenoid body )
sella turcica composed of :
1 tuberculum sellae-horn,ant.elevation
2 hypophysical fossa-pituitary fossa
3 dorsum sellae -back of saddle,pot.elevation
4 (all surrounded by clinoid proesses)
what is the pituitary gland (sella turcica )surrounded by?
ant,post. clinoid proesses (bed post)
comosed of sphenoid bone :
1 body -air sinuses
2 greater wing
3 lesser wing
4 pterygoid processes (legs)
foramina in middle cranial fossa:
1 optic canal cnll
2 sup.orbital fissure
3 foramen rotundum O V2
4 foramen ovale 0 V3
5 foramen spinosum middle meningeal artey
6 foramen lacerum
posterior cranial fossa made of:
largest and deepest fossa
1 post.surface of petrous temporal
2 occioital bone
3 very small portion of sphenoid body
posterior cranial fossa lcentrally
clivus
f.magnum
int .occipital crest
IOP
linear depression
-transverse v sinuses
-sigmoid v.sinuses
foramina in post.fossa:
1 foramen Magnum -biger middle one
2 jugular foramen -int,jugular v -CNlX -CNX -CNXl
3 hypoglossal canal -cn xll
4 internal acoustic meaturs -ear/ cn vll/ vlll 8
