1
.
| Cerebellar tonsil |
2
.
| Medulla oblongata |
3
.
| Margin of foramen magnum |
4
.
| Upper pointer: Posterior inferior cerebellar artery Lower pointer: Vertebral artery |
5
.
| Suboccipital nerve |
6
.
| Posterior arch of atlas (cut across) |
7
.
| Dorsal roots cervical nerve II |
8
.
| Obliquus capitis inferior muscle |
9
.
| Greater occipital nerve |
10
.
| Third occipital nerve |
11
.
| Muscular branch of cervical nerve III |
12
.
| Splenius capitis muscle |
13
.
| Posterior median sulcus |
14
.
| Posterior intermediate sulcus |
15
.
| Posterior lateral sulcus |
16
.
| Dorsal roots cervical nerve VI |
17
.
| Accessory filament of dorsal root which bifurcates to contribute to two cervical nerves |
18
.
| Dura mater |
19
.
| Spinal roots accessory nerve (XI) |
20
.
| Major posterior rectus capitis muscle |
21
.
| Posterior atlanto-occipital membrane (cut across) |
22
.
| Posterior spinal artery |
23
.
| Semispinalis capitis muscle (cut across) |
24
.
| Denticulate ligament |
25
.
| Upper pointer: Posterior internal vertebral venous plexus Lower pointer: Dura mater |
26
.
| Arch of vertebra C. IV (cut across) |
27
.
| Posterior external vertebral venous plexus |
28
.
| Multifidus muscle (cut across) |