Art Anatomy

Concave Forms on the Skeleton

A trochlea (TROK-lee-uh) is a spool-shaped form. A trochlea is shaped to receive a convexity at a joint and allow movement only through one plane.

A facet (fa-SET) is a shallow depression that recieves the convexity of another bone at a joint.

A fossa (FOSS-uh) is a hollow that is deeper than a facet.

A foramen (fuh-RAY-men) is a hole.

A groove is exactly that, a thin, linear depression.

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