The hole at the bottom of the skull where the brain is joined to the spinal cord.
A large opening at the base of the cranium near the occipital bone that the spinal cord passes through as it connects with the medulla oblongata.
The opening in the occipital bone through which the spinal cord passes from the brain.
The aperture situated at the bottom of the cranium, facilitating the passage of the spinal cord and the brain stem.