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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


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


the three tiny bones in the middle ear


hammer; first of the three auditory ossicles of the middle ear


anvil; middle of the three auditory ossicles of the middle ear


stirrup; last of the three auditory ossicles of the middle ear

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