بسم الله الرحمن الرحيم Anatomy of the ear

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بسم الله الرحمن الرحيم Anatomy of the ear Dr. Abdussalam M jahan ENT depart, Misurata university, faculty of medicine

Anatomy of the Ear Tympanic membrane Middle Ear External Ear: Auricle External auditory meatus Labyrinth , cochlea, 7th CN. Inner ear

External Ear

Tympanic Membrane Adult TM is about 9 mm in diameter. TM is obliquily placed, forms an acute angle with the inferior wall of EAC. Composed of three layers: the outer squamous cell epith layer. medial mucosal layer, and the middle fibrous layer : which gives TM its shape and consistency.

TM is divided into a superior pars flaccida pars tensa

V: Auriculo-temporal n. Nerve supply Facial n. C3 X vagus V: Auriculo-temporal n. Lesser occipital n. C2-3 IX glossopharyngeal Great auricular C3

Middle ear cleft ME cleft ET ME cavity Mastoid cavity Tympanum Epitymp. Mesotymp Hypotymp

Ossicles:

Eustachian Tube ET reaching its adult size by the age of 7 years. Average length = 36 mm.

Inner ear Cochlea Vestibular labyrinth

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