What is the name of the hole at the base of the skull through which the spinal cord passes?

The foramen magnum is the large opening at the base of the skull that allows the spinal cord to connect with the brain. This critical anatomical structure is situated in the occipital bone and serves as the passageway through which the central nervous system transitions from the brain to the vertebral column. Its size and position are significant in the study of human evolution, as they indicate bipedalism, positioning the skull in a way that supports upright walking. The placement of the foramen magnum reflects evolutionary adaptations in human ancestors, allowing for more efficient locomotion and balance.