| 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) |
