| 1
.
| Stapedius nerve and muscle |
| 2
.
| Tympanic sinus |
| 3
.
| Facial nerve (VII) (within facial canal) |
| 4
.
| Vestibule |
| 5
.
| Vestibulocochlear nerve (VIII) (vestibular part) (superior and inferior branches) |
| 6
.
| Internal acoustic meatus |
| 7
.
| Vestibulocochlear nerve (VIII) (cochlear part) |
| 8
.
| Modiolus |
| 9
.
| Upper pointer: Central end of facial nerve (Vll) (cut off) Lower pointer: Geniculate ganglion |
| 10
.
| Upper pointer: Tendon of tensor tympani muscle Lower pointer: Tympanic membrane |
| 11
.
| Major superficial petrosal nerve |
| 12
.
| Minor superficial petrosal nerve |
| 13
.
| Chorda tympani |
| 14
.
| Internal carotid artery |
| 15
.
| Middle meningeal artery |
| 16
.
| Otic ganglion |
| 17
.
| Mandibular nerve (V) |
| 18
.
| Tympanic antrum |
| 19
.
| Short crus of incus |
| 20
.
| External acoustic meatus (note transition from thick to thin skin at junction of cartilaginous and bony parts of wall of meatus) |
| 21
.
| Upper pointer: Manubrium of malleus Lower pointer: Capitulum of malleus |
| 22
.
| Veins of external auditory meatus tributary to posterior facial vein |
| 23
.
| Articular disc |
| 24
.
| Capitulum (condylar process) of mandible |
| 25
.
| External pterygoid muscle |
