Human Functions Test 1 Practice 2026 - Free Human Functions Practice Questions and Study Guide

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Which of the following thumb muscles, when considered for grip at the CMC joint, is primarily responsible for a strong grip?

Adductor pollicis

Thenar group

Gripping power at the thumb CMC joint comes from opposition—the thumb turning in to touch the fingers and press firmly against an object. The thenar group forms the main muscular bulk that makes this possible. Opponens pollicis rotates and positions the first metacarpal to bring the thumb into opposition. Abductor pollicis brevis and flexor pollicis brevis help align and stabilize the thumb pad for solid contact. When these muscles work together, they create a strong, stable platform for the grip, maximizing contact area and force.

Other muscles move the thumb in different directions or specialize in adduction or abduction, but the coordinated action of the thenar group is the primary driver of a strong grip at the CMC joint.

Abductor pollicis longus

Opponens pollicis