1
.
| Clivus |
2
.
| Accessory nerve (XII) |
3
.
| Upper pointer: Hypoglossal canal (opened) Lower pointer: Hypoglossal nerve (XII) |
4
.
| Vagus nerve (X) |
5
.
| Atlantooccipital joint cavity |
6
.
| Vertebral artery |
7
.
| Ventral branch cervical nerve I |
8
.
| Posterior arch of atlas |
9
.
| Lateral atlantoaxial joint cavity |
10
.
| Ganglion cervical nerve II |
11
.
| Dura mater |
12
.
| Posterior longitudinal ligament |
13
.
| Roots of hypoglossal nerve (XII) |
14
.
| Tectorial membrane (cut edge) |
15
.
| Cruciform ligament of atlas (divided, lower part retracted) |
16
.
| Fibrous tissue and blood vessels in anterior part of foramen magnum (ligamentum apicis dentis not well defined) |
17
.
| Vertebral artery (cut across) |
18
.
| Alar ligament (divided on left) |
19
.
| Dens (axis) (joint cavity between dens and transverse ligament opened) |
20
.
| Tectorial membrane (cut across) |
21
.
| Transverse ligament of atlas (divided) |
22
.
| Lateral atlanto axial joint capsule (opened) |
23
.
| Body of axis |