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50 terms

Ch. 12 Skull & Cranial Bones

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Glabella
The smooth area between the eyebrows just above the nose
supraorbital groove
Corresponds to the highest level of the facial bones
calvaria
Forms the roof and walls of the cranium.
supraorbital margin
Superior borders of each orbit
supraorbital notch
opening above each orbit allowing blood vessels and nerves to pass
frontal tuberosity
two round unmargined prominences at the upper part of the forehead
ethmoid notch
Midline gap between orbital plates
5
each parietal bone articulates with how many bones
4
the frontal bone articulates with how many bones
3
each temporal bone articulates with how many bones
2
the ethmoid articulates with how many cranial bones
7
the sphenoid bone articulates with how many cranial bones
6
the occipital bone articulates with how many bones
parietal tubercles
The widest part of the skull is found between these eminences
occipital bone
forms the inferoposterior portion of the skullcap
inion
external protuberance on the occipital bone
foramen magnum
the large opening at the base of the cranium through which the spinal cord passes
occipital condyles
rounded projections lateral to the foramen magnum that articulate with the first cervical vertebra
atlantooccipital joint
articulation between the atlas and the occipital bone of the skull
temporal bones
cranial bones that house the organs for hearing and balance
zygomatic arch
cheekbones are made from this bony structure
EAM
external end of ear canal
mastoid
process of the temporal bone behind the ear at the base of the skull
petrous pyramid
the hard dense bony process of temporal bone that houses middle ear structures
TEA
external landmark that corresponds to the level of the petrous ridge.
sphenoid
this cranial bone forms the anchor for the skull
sella turcica
houses the pituitary gland (hypophysis cerebri)
clivus
forms a base of support for the pons
anterior clinoid processes
the processes that extend from the lesser wings
optic groove
A transverse groove that crosses the front of the sella turcica
pterygoid hamuli
hooklike process on the inferior medial plates of the sphenoid bone.
dorsum sellae
The posterior wall of the sella turcica, a large ridge of bone projecting upward and forward.
cribriform plate
the horizontal plate of the ethmoid bone separating the cranial cavity from the nasal cavity.
crista galli
superior projection in the middle of the cribriform plate of the ethmoid bone
perpendicular plate
inferior projection of the ethmoid that forms the superior part of the nasal septum
superior and middle nasal conchae
also known as turbinates
frontal sinus
large cavity in frontal bone
sutures
another name for the articulations of the cranial bones
fibrous
the sutures are this type of joint
bregma
intersection of coronal and sagittal sutures
lambda
the junction of the sagittal and lamboid sutures of the skull
pterion
junction of frontal, parietal, temporal, and greater wing sphenoid bones
asterion
Where the lambdoid, parieto-mastiod, and occipito-mastoid sutures meet.
fontanels
Gaps between a baby's skull that slowly close up during the first 18 months of life
mastoid fontanel
Major connective fibrous tissue present at birth, where the squamous and lambdoid sutures meet
sphenoid fontanel
Major connective fibrous tissue present at birth, where the squamous and coronal sutures meet
anterior fontanel
Major connective fibrous tissue present at birth, where the sagittal and coronal sutures meet
posterior fontanel
Major connective fibrous tissue present at birth, where the sagittal and lamdoidal sutures meet
wormian bones
tiny irregularly shaped bones that appear within sutures
lateral labyrinth
the mass of bone that contains the nasal concha