Bassett Collection Large Image - Lane Medical Library, Stanford University Medical Center

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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