BIO 12 Lecture Notes - Lecture 20: Ossicles, Oval Window, Ear Canal
14 Sep 2020
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Document Summary
The external, inner, and middle ear contain the organs of balance and hearing. External ear - extends from the outside of the head to the eardrum. Middle ear - air filled chamber contains the auditory ossicles: the malleus, incus and the stapes. Inner ear - is a group of fluid-filled chambers that are involved in both balance and hearing. Flexible, visible part which composed mainly of elastic cartilage. Allows sound waves to enter the ear canal, which then directs those waves to the delicate eardrum or tympanic membrane. Is line with hairs and modified sebaceous glands called ceruminous glands that produce earwax or cerumen. The hair and ear wax protect the eardrum from foreign objects. Silvery gray in color, is very delicate and sounds waves cause it to vibrate. Separates the outer and the middle ear. Is the air-filled cavity that contains the three auditory ossicles or ear bones:
