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PIMA BIO130

CHP8 Skeletal; Cranial Bones and Their Markings; Parietal and Temporal

QuestionAnswer
Parietal Bone Prominent, bulging bones behind the frontal bone; forms the top sides of the cranial cavity
Temporal Bone Form the lower sides of the cranium and part of the cranial floor; contain the middle and inner ear structures
Squamous Thin, flaring upper part of bone
Mastoid portion Rough-surfaced lower part of the bone posterior to the external acoustic meatus
Petrous portion Wedge-shaped process that forms part of the center section of the cranial floor between the sphenoid and occipital bones; name derived from Greek word for stone because of the extreme hardness of this process; houses the middle and inner ear structures
Mastoid process Protuberance just behind the ear
Mastoid air cells Mucosa-lined, air-filled spaces within the mastoid process
External acoustic meatus (or canal) Tube extending into the temporal bone from the external ear opening to the tympanic membrane
Zygomatic process Projection that articulates with the zygomatic (or malar) bone
Internal acoustic meatus Fairly large opening on the posterior surface of the petrous portion of the bone; transmits the eighth cranial nerve to the inner ear and the seventh cranial nerve on its way to the facial structures
Mandibular fossa Oval-shaped depression anterior to the external acoustic meatus; forms the socket for the condyle of the mandible
Styloid process Slender spike of bone extending downward and forward from the undersurface of the bone anterior to the mastoid process; often broken off in a dry skull; several neck muscles and ligaments attach to the styloid process
Stylomastoid foramen Opening between the styloid and mastoid processes where the facial nerve emerges from the cranial cavity
Jugular fossa depression of the undersurface of the petrous portion; dilated beginning of the internal jugular vein lodged here
Jugular foramen Opening in the suture between the petrous portion and occipital bone; transmits the lateral sinus and ninth, tenth, and eleventh cranial nerves
Carotid canal (or foramen) Channel in the petrous portion; best seen from the undersurface of the skull; transmits the internal carotid artery
Created by: Jgiron6994