| 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 |
