The position of the foramen magnum is related to the degree of erectness of the habitual stance of the organism.

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The position of the foramen magnum, the opening in the skull through which the spinal cord enters and connects to the brain, is related to the degree of erectness of the habitual stance of the organism. In more erect organisms such as humans, the foramen magnum is positioned centrally beneath the skull, whereas in more quadrupedal organisms it is positioned more towards the back of the skull to allow for the spine to enter at a more horizontal angle.

The Position of the Foramen Magnum Is Related to the Degree