ANAT 3010 Lecture Notes - Lecture 21: Ear Canal, Tympanic Cavity, Eardrum
19 Mar 2020
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Anat 3010 lecture 21 march 9, 2020 special senses ii: hearing and balance. The ear: hearing and equilibrium: the ear receptor organ for hearing and equilibrium, composed of three main regions, outer ear functions in hearing, middle ear functions in hearing. The outer (external) ear: composed of, the auricle (pinna) helps direct sounds, external acoustic meatus contains hairs, sebaceous glands, and ceruminous glands, tympanic membrane forms the boundary between the external and middle ear. The outside of the external acoustic meatus is cartilage covered with skin, but the deeper portion is consisted of the temporal bone, which continues into the tympanic membrane. The acoustic meatus skin surface has lots of glands that create the earwax to repel insects and hair that prevents dirt from going in. The tympanic membrane is the border between the outer and middle ear. It is cone-shaped, pointing towards the inside middle ear.
