Exercise 9 Flashcards
the axial skeleton THE SKULL!
Three divisions of the axial skeleton
skull, vertebral column and thoracic cage
what does the division of axial skeleton do
form longitudinal axis of body, protects brain, spinal cord, the heart and lungs
what are the two divisions of the skull
cranium and facial
how many bones make up the cranium
8
how many bones make up the facial
14
what do the cranium bones do
protect the brain
what doe the facial bones do
support the eyes and provide attachment for facial muscles
how is the skull put together
by sutures
what are sutures
interlocking fibrous joints
what is the exception to the sutures and why
the mandible because it is connected by freely moving joints
name the 8 bones of the cranium
frontal, temporal, parietal, occipital, sphenoid and ethmoid
how many bones make up each
1 frontal, 2 parietals, 2 temporals, 1 occipital, sphenoid and ethmoid.
what is the supraorbital margin
thin margin of eye socket that lies beneath the eyebrows above eyes
the frontal bone
forms the forehead
parietal bone
form superior and lateral aspect of skull
temporal bone
form inferolateral part of skull and contribute to middle cranial fossa
Squamous part
inferior to squamous suture
describe squamous part
located on temporal bone. wide region above the zygomatic process
zygomatic process
bridge-like projection that articulate with zygomatic bone
describe zygomatic process
pointy thing coming out the ear to form the cheeks
mandibular fossa
inferior to zygomatic process. receive condylar process of mandible
tympanic part
sorrounds the external ear opening
external acoustic meatus
canal leading into midear and eardrum
describe external meatus
inside your ear
styloid process
needle like projection that serves as attachment point for ligaments and neck muscles
describe styloid process
look like needle going into neck. Pointy thing coming out the external acoustic meatus
petrous part
form a bony wedge between spehnoid and occipital bone
juglar foramen
located where the petrous part joins the occipital bone
describe juglar foramen
inside the brain. Lateral to faramen magnum (BIG HOLE)
corotid canal
opening through which internal corotid artery pass into cranial cavity.
describe corotid canal
above juglar foramen
mastoid process
bump behind external acoustic meatus
occipital bone
posterior aspect of skull
foramen magnum
large opening; hole in base of occipital bone
occipital condyle
bumpy rounded projection lateral to foramen magnum
external occipital proruberance
midline prominence behind the foramen magnum
superior nachal line
below and lateral to foramen magnum
sphenoid bone
bat shaped described as the keystone bone of cranium
pterygoid process
project below from greater wing
superior orbital fissures
sits in orbits…..lateral to optic canal. opening in greater wing
sella turcica
turkish saddle above body of the sphenoid bone
optic canal
openings in the base in lesser wing
ethmoid
anterior cranial fossa. form part of nasal septum and nasal cavity
crista galli
big pointy rooster’s comb superior projection
cribriform plate
lateral to crita galli and little holes on the plate is the cribriform faramina
perpendicular plate
big pointy inferior projection
name the sutures
sagittal suture, coronal suture, squamous suture and lambdoid
what do all the sutures have in common
they are located where the parietal bones articulate with eachother
what is the sagittal suture
connect the 2 parietal bones
what is the coronal suture
connects frontal bone to two parietals
what is the squamous suture
connect parietal bones to temporal bones
what is the lambdoid suture
connect occipital with 2 parietal bone
