Saddle joints have concave and convex surfaces. Identify the saddle joint of the skeleton.
A) Interphalangeal joint of the finger.
B) Meatcarpophalangeal joint of the finger.
C) Carpometacarpal joint of the phalanges.
D) Carpometacarpal joint of the thumb.

Question

Quizplus · Accepted Answer

The carpometacarpal joint of the thumb is a saddle joint, where the distal end of the metacarpal bone is saddle-shaped and articulates with the trapezium bone, which has a convex surface. This joint allows for a wide range of movement, including opposition and reposition of the thumb. The other options listed are hinge joints (A and B) or plane joints (C).

Saddle Joints Have Concave and Convex Surfaces