Question

multiple choice question
a joint in which one bone with a convex surface fits into another bone with a concave depression is a ______ joint.
planehinge
pivot
condylar
saddle

Explanation:

A saddle joint has one bone with a convex surface fitting into another bone's concave depression. Plane joints have flat - surfaced bones that glide over each other. Hinge joints allow movement like a door hinge in one plane. Pivot joints allow rotational movement around a single axis. Condylar joints have an oval - shaped condyle fitting into an elliptical cavity.

Answer:

saddle