| 1
.
| Mucosa of sphenoid sinus (bony wall removed) |
| 2
.
| Optic nerve (II) |
| 3
.
| Periorbita (in areas adjacent to this the bony roof of the orbit has been partially cut away to reveal an extensive network of veins within the substance of the bone) |
| 4
.
| Oculomotor nerve (III) and trochlear nerve (IV) |
| 5
.
| Maxillary nerve (V2) passing into foramen rotundum |
| 6
.
| Ophthalmic nerve (Vl) |
| 7
.
| Greater wing of sphenoid (cut across near junction with body of sphenoid bone) |
| 8
.
| Mandibular nerve (V3) passing into foramen ovale |
| 9
.
| Periosteum covering contents of pterygopalatine fossa (exposed by cutting away overlying bone) |
| 10
.
| Periosteum of infratemporal fossa (fibers of origin of external pterygoid muscle are visible) |
| 11
.
| Foramen ovale (periosteal lining intact) |
| 12
.
| Thickened margin of dura mater along crest which separates anterior from middle cranial fossa |
| 13
.
| Middle meningeal artery |
| 14
.
| Temporalis muscle |
| 15
.
| Sella turcica |
| 16
.
| Internal carotid artery |
| 17
.
| Trigeminal nerve (V) |
| 18
.
| Major superficial petrous nerve and middle meningeal artery |
| 19
.
| Cochlea |
| 20
.
| Facial nerve (VII) (pointer at junction of internal acoustic meatus and facial canal) |
| 21
.
| Upper pointer: Vestibule Lower pointer: Semicircular canal (lateral) |
| 22
.
| Upper pointer: Anterior part of tympanic cavity Lower pointer: Incus |
| 23
.
| Articular disc of mandible |
| 24
.
| Tympanic antrum |
| 25
.
| Periosteum of external acoustic meatus |
