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30 terms

AP for Nurses_Bones_Head

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frontal bone
large flat bone forming forehead and roof of orbit
frontal tuberosities
forms the forehead proper, part of the frontal bone
frontal sinuses
open into the nasal cavity; part of the frontal bone
parietal bones
sides and roof of the cranium
fontanelles
membranous gaps in the skull at the angles of the parietal bone at birth
occipital bone
back of the skull
external occipital protuberance
provides attachment for muscles; part of the occipital bone
foramen magnum
large opening from cranial cavity that connects to the vertebral canal
occipital condyles
located on both sides of the foramen magnum, provide articulation with the first cervical vertebra; part of the occipital bone
temporal bones
cranial bones situated at the sides and base of the skull
squamous part ( of the temporal bone)
is thin and flat and forms the anterior and upper part of the temporal bone
zygoma (or zygomatic process)
a long arched process that projects forward from the lower portion of the squamous part of the temporal bone
petromastoid part
forms the posterior portion of the temporal bone
mastoid process
conical protuberance of the petromastoid portion of the temporal bone that is situated behind the ear and serves as a site of muscle attachment
petrous portion
between the occipital bone and the sphenoid, this is part of the petromastoid part of the temporal bone
tympanic part
curved plate lying below the squamous part and in front of the mastoid process, this contains the external acoustic meatus; part of the temporal bone
styloid process
projects downwards and forwards from the underside of the temporal bone; one of the four "parts" of the temporal bone
The Four Parts of the Temporal Bones
squamous part, petromastoid part, tympanic part, styloid process
ethmoid bone
very light, irregularly shaped bone located between the eye orbits
cribriform plate
a small horizontal plate perforated by many fine openings, or foramina, for the passage of the olfactory nerves; part of the ethmoid bone
perpendicular plate
descends from the cribriform plate and forms the upper part of the nasal septum; part of the ehtmoid bone
labyrinths
two of them, each consisting of many thin-walled ethmoidal air cells that communicate with the nasal cavity. Part of the ethmoid bone
superior and middle nasal conchae
two thin plates of bone that jut out into the nasal cavities from the spongy labyrinths of the ethmoid bone
The Three Parts of the Ethmoid Bone
cribriform plate, perpendicular plate, labyrinths (of which there are two total)
sphenoid bone
in front of the temporal bones at the base of the skull, shaped like a bat with outstretched wings
hypophyseal fossa
a deep depression in the sphenoid bone, contains the pituitary gland
inferior nasal conchae
curved plates of bone that lie in the walls of the nasal cavity, below the superior and middle nasal conchae of the ethmoid bone
lacrimal bones
smallest and most fragile of the cranial bones, form part of the walls of the orbits.
nasal bones
two small, oblong bones that together form the bridge of the nose
vomer
flat bone forming the lower part of the septum of the nose