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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


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


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


flat bone forming the lower part of the septum of the nose

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