Foramen magnum
The structures passing through the foramen magnum are:
Anterior Part: 1. Apical ligament of dense.
2. Vertical band of cruciate ligament
3. Membrana tectoria
Subarachnoid Space:
- Vertebral artery
- Ant. Spinal artery
- Post. Spinal artery
- Spinal accessory nerve.
- Sympathetic plexus around vertebral arteries.
Posterior part: 1. Lower part of medulla.
2. Meninges.