Human Functions Test 1 Practice

Joints involved in making a fist

Radiocarpal joint MCP, PIP, DIP, and IP Joint (Thumb) Humeroradial joint MCP and DIP only

Correct Answer:

MCP, PIP, DIP, and IP Joint (Thumb)

Explanation:

Making a fist mainly comes from curling the fingers by bending their joints. Each finger has three joints that bend when you curl: the metacarpophalangeal joints at the base, the proximal interphalangeal joints in the middle, and the distal interphalangeal joints near the fingertips. Flexing all of these joints allows the fingers to fold toward the palm. The thumb participates by bending its interphalangeal joint, helping it tuck against the fingers for a secure grip. The wrist and elbow aren’t the joints that form the fist; they influence position and leverage, but the actual curling comes from these finger joints and the thumb’s IP joint. So, the joints involved are the MCP, PIP, and DIP joints of the fingers, plus the IP joint of the thumb.

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