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 |