| 1
.
| Temporalis muscle (cut across) |
| 2
.
| Middle meningeal artery (anterior branch) |
| 3
.
| Ophthalmic nerve (VI) (within cavernous sinus) |
| 4
.
| Middle meningeal artery (posterior branch) |
| 5
.
| Cavernous sinus |
| 6
.
| Semilunar ganglion (trigeminal) |
| 7
.
| Tegmen tympani (a small dural sinus lies over the tegmen) |
| 8
.
| Arcuate eminence |
| 9
.
| Superior petrosal sinus |
| 10
.
| Lesser wing sphenoid bone (covered with dura) |
| 11
.
| Inferior cerebral vein and venous sinus connecting posteriorly with superior petrosal sinus |
| 12
.
| Optic nerve (II) |
| 13
.
| Anterior clinoid process |
| 14
.
| Internal carotid artery |
| 15
.
| Posterior communicating artery |
| 16
.
| Oculomotor nerve (III) (lower pointer indicates the part of the nerve within the interpeduncular cistern, upper pointer indicates the portion within the cavernous sinus) |
| 17
.
| Margin of tentorium cerebelli |
| 18
.
| Cerebral peduncle |
| 19
.
| Substantia nigra |
| 20
.
| Trochlear nerve (IV) (upper pointer indicates the nerve within the cavernous sinus, lower pointer indicates the nerve within the subarachnoid space) |
| 21
.
| Trigeminal nerve (V) |
| 22
.
| Superior cerebellar artery (cut across) |
| 23
.
| Facial nerve (VII) |
| 24
.
| Vestibulocochlear nerve (VIII) |
| 25
.
| Brachium pontis (middle cerebellar peduncle) (cut across) |
| 26
.
| Roots glossopharyngeal nerve (IX) and vagus (X) |
