1
.
| Accessory nerve (XI) |
2
.
| Hypoglossal nerve (XII) (within hypoglossal canal the nerve is obscured by fibrous tissue and veins) |
3
.
| Vagus nerve (X) |
4
.
| Internal jugular vein |
5
.
| Occipital condyle (cut across) |
6
.
| Atlantooccipital joint (opened) |
7
.
| Superior articular facet of atlas (articular cartilage removed) |
8
.
| Vertebral artery (cut across) |
9
.
| Transverse process of atlas |
10
.
| Upper pointer: Ventral branch cervical nerve I Lower pointer: Groove in atlas for vertebral artery |
11
.
| Spinal ganglion cervical nerve II |
12
.
| Ventral branch cervical nerve II |
13
.
| Dorsal branch cervical nerve II |
14
.
| Posterior longitudinal ligament (cut across) |
15
.
| Cruciform ligament of atlas (cut across) |
16
.
| Plexus of veins (ligamentum apicis dentis absent) |
17
.
| Dens (axis) (covered by ligaments) |
18
.
| Alar ligament (cut across) |
19
.
| Transverse ligament of atlas (part of cruciform ligament) |
20
.
| Tectorial membrane (cut across) |
21
.
| Joint cavity |
22
.
| Joint capsule lateralis (together 21 and 22 form lateral atlanto-occipital joint) |
23
.
| Arch of axis (cut across) |