anatomy special senses - Special Senses: Auditory,...

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I. Anatomy of the Ear Ear contains receptors for both hearing and equilibrium Divided into three chambers: External Ear Auricle (pinna)- cartilaginous structure that en- circles opening into the skull External Acoustic Meatus (external auditory canal)- short narrow chamber lined with wax secreting glands. Tympanic membrane (eardrum)- vibrates in response to fre- quency of sounds. Middle Ear Ossicles- Three small bones that transmit vibrations to a oval window which enters into the internal ear for fluid conduction. Malleus- Hammer Incus- Anvil Stapes- Stirrup Pharyngotympanic (auditory) tube- connects middle ear to the nasopharynx of the throat. Equalizes pressure of the middle ear with external pressure: Yawning and swallowing Inner Ear- Bony Labyrinth Filled with a fluid called perilymph Labyrinth- floats in perilymph Filled with endolymph Divisions: Cochlea- Spiral/shell like Scala vestibuli- upper cham- ber Scala tympani- lower
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This note was uploaded on 10/03/2011 for the course ANAT 101 taught by Professor Staff during the Spring '10 term at Western Kentucky University.

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anatomy special senses - Special Senses: Auditory,...

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