| 1
.
| Posterior semicircular canal |
| 2
.
| Inferior petrosal sinus |
| 3
.
| Upper pointer: Glossopharyngeal nerve (IX) Lower pointer: Vagus nerve (X) |
| 4
.
| Superior jugular venous bulb (jugular foramen opened, vein emptied of latex, and its anterior wall dissected to show artery to jugular ganglion of vagus nerve) |
| 5
.
| Roots of hypoglossal nerve (XII) (hypoglossal canal opened to reveal veins and fibrous tissue enclosing nerve) |
| 6
.
| Occipital bone (cut across) |
| 7
.
| Prevertebral fascia (exposed by removal of rectus capitis lateralis muscle) |
| 8
.
| Atlantooccipital cavity of articulation |
| 9
.
| Vertebral artery (cut across) |
| 10
.
| Upper pointer: Anterior branch of cervical nerve I Lower pointer: Groove in atlas for vertebral artery |
| 11
.
| Inferior oblique capitis muscle (cut across) |
| 12
.
| Spinal ganglion cervical nerve II |
| 13
.
| Tendinous slip of longissimus cervicis muscle (cut across) |
| 14
.
| Arch of axis (cut across) |
| 15
.
| Joint capsule |
| 16
.
| Posterior branch cervical nerve III |
| 17
.
| Levator scapulae muscle |
| 18
.
| Trigeminal nerve (V) |
| 19
.
| Vestibulocochlear nerve (VIII) |
| 20
.
| Clivus |
| 21
.
| Dura mater encephali (cut edge) |
| 22
.
| Upper pointer: Posterior longitudinal ligament Lower pointer: Cruciate ligament atias |
| 23
.
| Alar ligament (cut across on left) |
| 24
.
| Position of dens (axis) |
| 25
.
| Cut edge of tectorial membrane |
| 26
.
| Transverse ligament atlas (part of cruciate ligament) |
| 27
.
| Dura mater |
