| 1
.
| Semicircular canal (lateral) (note delicate lateral semicircular duct within canal) |
| 2
.
| Facial nerve (VII) in facial canal |
| 3
.
| Geniculate ganglion (at geniculum facial nerve) |
| 4
.
| Lessor superficial petrosal nerve (part of the course of this nerve is obscured by the semicanal for the tensor tympani muscle) |
| 5
.
| Major superficial petrosal nerve |
| 6
.
| Tensor tympani muscle and nerve supply from otic ganglion |
| 7
.
| Semilunar ganglion |
| 8
.
| Otic ganglion (most of its connections cut away) |
| 9
.
| Lateral plate (cartilaginous) auditory tube |
| 10
.
| Medial plate auditory tube |
| 11
.
| Internal carotid artery |
| 12
.
| Ascending pharyngeal artery |
| 13
.
| Tympanic antrum |
| 14
.
| Stapes |
| 15
.
| Stapedius muscle and its nerve supply |
| 16
.
| Upper pointer: Subiculum of promontory Lower pointer: Fenestrated cochlear fossa |
| 17
.
| Tympanic plexus (superior and inferior caroticotympanic branches which pass anteriorly to reach carotid canal were not identified) |
| 18
.
| Tympanic cells |
| 19
.
| Tubal branches tympanic plexus |
| 20
.
| Stylomastoid foramen (cut open) |
| 21
.
| Right pointer: Tubal air cells Left pointer: Junction of bony part with cartilaginous part auditory tube |
| 22
.
| Sheath for styloid process |
| 23
.
| Rectus capitis lateralis muscle |
| 24
.
| Internal jugular vein |
