This bone is situated at the superior extremity of the cranium, and, as we have already pointed out, furnishes two large condyles, by which it articulates with the atlas, or first bone of the neck (15, fig. 289). Above, it forms the crest or prominence between the ears, while below it gives off a process (basilar process) which passes forward to assist in forming the base of the skull. Behind, it forms the superior boundary of the cranium, where it presents two rounded projections or condyles. Between these is a large opening (foramen magnum), through which the brain is connected with the spinal cord. On the outer side of the occipital condyles a bony projection (styloid process) is found. This, like other parts of the bone, affords attachment to important muscles.