11. Occasionally, they extend into the basilar part of the occipital bone nearly as far as the foramen magnum . 12. The " foramen magnum " is triangular in the North American beaver, and rounded in the European. 13. The position of the foramen magnum is very posterior to make way for the expanded jaw and enlarged hyoid bone. 14. It arises from the anterior surface of the basilar part of the occipital bone immediately in front of the foramen magnum . 15. Foramen Magnum : The Hole located in the base of one's skull, where the spinal cord passes through.16. The evolution of locking knees and the movement of the foramen magnum are thought to be likely drivers of the larger population changes. 17. Next, he takes a distressingly small Caucasian skull, shakes hard, and pushes mightily at the foramen magnum with his thumb. 18. Another landmark is the "'basion "'located at the midpoint on the anterior margin of the foramen magnum . 19. The foramen magnum is located towards the front, and the atlas has shallow anterior articular facets which allow the condyles to attach. 20. Below the neurocranium is a complex of openings ( foramina ) and bones, including the foramen magnum which houses the neural spine.
