Obliquus Capitis Inferior is a thick, fleshy muscle, somewhat longer than the last described, and situated immediately below it.

Origin. - From the outer surface of the superior spinous process of the second cervical vertebra (axis or dentata).

Insertion. - Into the superior surface of the wing of the atlas.

Action. - To rotate the atlas on the dentata. Its action is shown in a striking manner when the horse shakes his head.