Ch. 12 Skull & Cranial Bones

50 terms by allen2994 

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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

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