CHAPTER_THIRTEEN

CHAPTER_THIRTEEN - CHAPTER 13 THE EAR The two functions of...

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CHAPTER 13 THE EAR The two functions of the ear are to hear and to provide a sense of balance. The ear is made up of three parts: the external ear, the middle ear, and the inner ear (labyrinth). We hear because sound waves vibrate through the ear where they are transformed into nerve impulses that are then carried to the brain. STRUCTURES OF THE EAR STRUCTURE DEFINITION external ear auricle (pinna) located on both sides of the head. The auricle directs sound waves into the external auditory meatus. external auditory meatus (canal) short tube that ends at the tympanic membrane. The inner part lies within the temporal bone of the skull and contains the glands that secrete earwax (cerumen). middle ear tympanic membrane (eardrum) semitransparent membrane that separates the external auditory meatus and the middle ear cavity eustachian tube connects the middle ear and the pharynx. It equalizes air pressure on both sides of the eardrum. ossicles bones of the middle ear that carry sound vibrations. The ossicles comprise the malleus (hammer), incus (anvil), and stapes (stirrup). The stapes connects to the oval windew, which carries the sound vibrations to the inner ear. labyrinth (inner ear
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This note was uploaded on 11/22/2010 for the course HSC 2531 taught by Professor Chancey during the Spring '10 term at Santa Fe College.

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CHAPTER_THIRTEEN - CHAPTER 13 THE EAR The two functions of...

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