Question

question 71

the metacarpophalangeal joints at the base of the fingers are ________ joints.

a ball-and-socket
b condylar
c pivot
d hinge
e plane (gliding)

Explanation:

Identify the joint in question

Using the Synovial Joints and Structural Joint Classification knowledge points
The question asks for the structural classification of the metacarpophalangeal (MCP) joints, which are located at the base of the fingers (knuckles).

Analyze the movement and structure of MCP joints

Using the Synovial Joints and Structural Joint Classification knowledge points
The MCP joints allow movement in two planes (biaxial): flexion/extension and abduction/adduction. This movement is characteristic of an oval-shaped condyle fitting into an elliptical cavity.

Match with the correct option

Using the Synovial Joints and Structural Joint Classification knowledge points
Anatomically, biaxial joints with this structure are classified as condylar (or ellipsoid) joints. Therefore, the correct option is B.

Answer:

• A ball-and-socket
• B condylar (Correct answer)
• C pivot
• D hinge
• E plane (gliding)