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39 terms

bones & features of skull

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Frontal Bone
the large cranial bone forming the front part of the cranium: the forehead and the upper part of the orbits
Frontal Sinus
one of a pair of cavities in the frontal bone
Glabella
The smooth area between the eyebrows just above the nose
Supraorbital Foramen
small opening superior to each eye socket
Parietal Bone
either of two skull bones between the frontal and occipital bones and forming the top and sides of the cranium
Temporal Bone
a thick bone forming the side of the human cranium and encasing the inner ear
Mastoid Process
process of the temporal bone behind the ear at the base of the skull
External Auditory Meatus
ear canal
Mandibular Fossa
the depression in the temporal bone into which the condyle of the mandible fits.
Zygomatic Process
part of the temporal bone that forms part of the cheekbone
Styloid Process
pole like process extending downward from the temporal bone on each side of the skull
Petrous Portion/Region
area that forms the lateral portions of the skull base
Internal Acoustic Meatus
a canal in the petrous part of the temporal bone of the skull
Occipital Bone
the bone found at the back and base of the skull
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 (atlas)
Hypoglossal Canal
opening medial and superior to the occipital condyle through which the hypoglossal nerve passes
External Occipital Protuberance
midline prominences posterior to the foramen magnum
Sphenoid Bone
the bat-shaped bone that extends behind the eyes and forms part of the base of the skull
Greater/Lesser Wings of the Sphenoid
lesser and greater lateral protrusions from the sphenoid body, named for their shape
Superior Orbital Fissure of the Sphenoid
fissure between greater and lesser wings of sphenoid, visible from the orbits
Sella Turcica
a saddle-shaped region in the sphenoid midline which nearly encloses the pituitary gland; feature of the sphenoid bone
Optic Foramina
Small circular holes on top inside corner of eye, closest to eyes; feature of sphenoid bone that travels through the lesser wings to the orbits.
Foramen Rotundum
1st of three holes from anterior, situated laterally of the sella turcica, most anterior hole
Foramen Ovale
2nd of three holes from anterior, situated laterally of the sella turcica, middle hole
Foramen Spinosum
3rd of three holes from anterior, situated laterally of the sella turcica, most posterior hole
Ethmoid Bone
irregularly shaped bone anterior to the sphenoid. Forms the roof and upper septum of the nasal cavity and part of the medial orbit walls.
Crista Galli
superior projection in the middle of the cribriform plate of the ethmoid bone
Cribriform Plate
porous bone surrounding the crista galli in the floor of the cranium through which olfactory nerves transverse
Superior and Middle Nasal Concha (Turbinates)
(conchae) the mucous membrane covered, scroll-like bones projecting from the lateral walls of the nasal cavity that clean, moisten, and warm inhaled air
Sagittal Suture
midline articulation point of the two parietal bones
Coronal Suture
the suture between the parietal and frontal bones of the skull
Squamousal Suture
the suture found between the parietal & temporal bone
Lambdoidal Suture
suture that separates parietal bones from occipital bone
Metopic Suture
the suture between the two ossification centers of the frontal bone, it usually disappears during development but is occasionally present in adults
Ossicles
the three tiny bones in the middle ear
Malleus
hammer; first of the three auditory ossicles of the middle ear
Incus
anvil; middle of the three auditory ossicles of the middle ear
Stapes
stirrup; last of the three auditory ossicles of the middle ear