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Anat and Phys W4

Anatomy of the temporal bone

QuestionAnswer
Number of bones that compose the human skull. 22 bones
What is housed in the temporal bone? Cochlea Ossicles of ME Vestibular apparatus 7th and 8th cranial nerves Part of the EAM
What does the skull do for hearing? Allows for "3D" hearing.
What is the temporal bone sometimes referred to as? Bony labyrinth. However, sometimes the cochlea is referred to as the bony labyrinth and so is the vestibular system.
Five parts of the temporal bone. 1) Squama 2) Petrous 3) Mastoid 4) Tympanic parts 5) Styloid process
What does the squama portion of temporal bone form? Describe it. Anterior and upper part of the bone. It is thin and translucent. The outer surface is smooth.
How does the temporal line run? Up and back. Also called the supramastoid crest. Serves as the attachment of the temporal fascia, and the temporalis muscle runs down it.
How is the cheek bone formed? By the zygomatic process of the temporal bone and the temporal process of the zygomatic bone.
Where does the suprameatal triangle lie? What can be accessed through the suprameatal triangle? Lies b/w the posterior wall of the EAM and posterior root of the zygomatic process. An instrument can be used to push through this area into the tympanic antrum (air-filled cavity in mastoid process communicating with tympanum. Location of inflammation).
Where does the chorda tympani nerve pass through? Passes through canal of Huhuier, which passes near the anterior edge of the petrotympanic fissure.
When does the temporal bone ossify? Starts ossifying in fetal life, but certain areas do not ossify until after birth, with some not ossifying until after puberty.
What is the internal shape of the squama? Concave. The depressions correspond to the convolutions of the temporal lobe of the brain.
What does the internal auditory meatus house? Transmits the facial and auditory nerves from the cochlea.
What is important for the posterior fossa? Houses the cerebellum and brainstem. Area surgeon enters when removing acoustic and brainstem tumors.
What is important about the middle fossa? Accommodates anterior-inferior aspect of the temporal lobe.
How much hearing loss can one experience with TMJ? No hearing loss.
What does the temporal-mandibular joint form? Forms the anterior wall of the external auditory meatus.
What can TMJ cause? Can cause ear pain. Excessive movement of temporal-mandibular joint can result in displacement of hearing aids (fitting problems).
Created by: duda713
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