Foramen Magnum

Definition

A large opening at the base of the skull through which the spinal cord passes to connect with the brain.

Etymology

From Latin 'foramen', meaning 'opening' or 'hole', and 'magnum', meaning 'large'.

Example

The foramen magnum allows the central nervous system to extend from the brain into the spinal cord.

Related Terms

• Occipital bone
• Spinal cord
• Brainstem

Usage Notes

The foramen magnum is a crucial structure in vertebrate anatomy, including insects and arachnids, though it is more commonly discussed in the context of higher vertebrates.