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

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

3. External Ear

4. 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.

5. TM is divided into a superior pars flaccida
pars tensa

6. 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

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

8. Ossicles:

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

10. Inner ear
Cochlea
Vestibular labyrinth

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