temporal bone Flashcards
the temporal bone articulate with what ?
o articulates with mandible, zygomatic, parietal, sphenoid and occipital bones
temporal bone protect which organs ?
sense organ of inner ear
o squamous part
lateral portion joined to parietal bone by squamous suture
• inferior margin - zygomatic process (anterior projecting) of the temporal bone
• joins with the temporal process of zygomatic bone to form zygomatic arch (“cheekbone”)
o mandibular fossa
site of articulation with mandible
• located inferior to zygomatic process
o external auditory meatus (canal)
posterior and lateral to mandibular fossa
• transmits sound waves toward tympanic membrane of ear
o mastoid process
posterior and inferior to external auditory meatus
• projection of bone filled with air cavities = mastoid air cells
• mastoid air cells connected to middle ear
• attachment site of neck muscles that rotate head
o petrous part
thick bony ridge on interior and inferior to squamous part
• hollow and contains the middle (containing auditory ossicles) and inner ears
• internal acoustic meatus
carries blood vessels and nerves to inner ear
• carotid canal
anterior and medial to jugular fossa (anterior half of jugular foramen)
• passageway for internal carotid artery (main blood supply to brain)
• thin plate of bone separates the carotid canal from the middle ear allowing person to hear their own heartbeat (pulsing of carotid blood flow) when frightened or after running
• styloid processes
long pointed projection of bone from the floor of the temporal bone
= bony attachment for muscles that move tongue, pharynx and larynx
Temporal bones form …
o form lateral and inferior walls of cranium and zygomatic arches of cheek
