Dissection of left ear from superior aspect

Tympanic cavity and labyrinth, superolateral view

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Image #61-3
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Dissection of left ear from superior aspect
Tympanic cavity and labyrinth, superolateral view
1 . Dissected area on posterior aspect of petrous part of temporal bone
2 . Common crus
3 . Upper pointer: Subarcuate fossa Lower pointer: Vestibule (membrane of utricle visible)
4 . Facial nerve (VII)
5 . Upper (utriculoampullar) division of vestibulocochlear nerve (VIII)
6 . Cochlea (pointer on modiolus)
7 . Geniculate ganglion
8 . Greater superficial petrosal nerve
9 . Upper pointer: Tendon of tensor tympani muscle Lower pointer: Position of anterior process of malleus
10 . Lessor superficial petrosal nerve
11 . Communicating branch between above nerve (10) and plexus along middle meningeal artery
12 . Middle meningeal artery (cut off)
13 . Semilunar ganglion (reflected laterally)
14 . Lateral semicircular canal
15 . Superior semicircular canal
16 . Tympanic antrum
17 . Posterior ligament of incus
18 . Upper pointer: Long crus of incus Lower pointer: Body incus
19 . Fold of incus
20 . Capitulum of malleus
21 . Lateral margin of tympanic cavity
22 . Mastoid cells