part of part of exoccipital bone zone of bone organ occipital condyle http://upload.wikimedia.org/wikipedia/commons/8/88/Gray129.png condylus occipitalis AAO:0000330 The occipital condyles are undersurface facets of the occipital bone in vertebrates, which function in articulation with the superior facets of the atlas vertebra. The condyles are oval or reniform (kidney-shaped) in shape, and their anterior extremities, directed forward and medialward, are closer together than their posterior, and encroach on the basilar portion of the bone; the posterior extremities extend back to the level of the middle of the foramen magnum. The articular surfaces of the condyles are convex from before backward and from side to side, and look downward and lateralward. To their margins are attached the capsules of the atlantoC6ccipital articulations, and on the medial side of each is a rough impression or tubercle for the alar ligament. At the base of either condyle the bone is tunnelled by a short canal, the hypoglossal canal. UBERON:0006811 exoccipital condyle FMA:52861 birds have a single occipital condyle, mammals have two[WP] Wikipedia:Exoccipital_condyle