Hrdlicka, Aleš. 1904. "Anomalous articulation and fusion of the atlas with the occipital bone. Abstract." Washington Medical Annals, 3, (1) 1–2.
The origin of the occipital condyles of the skulls of vertebrata has not so far been elucidated. They are separate elements from the occipital arch and are ultimately superimposed on the latter, ...