Upper Extremity Analysis of the Wrist - Fundamentals and Assessment Tools for Occupational Ergonomics - page 846

(a)

Abductor
pollicis
brevis
Opponens
pollicis

Flexor
retinaculum

Palmaris brevis

Flexor
pollicis
brevis

Opponens
digiti minimi

Abductor
digiti minimi

Flexor digiti
minimi brevis

Abductor
pollicis

Lumbricales

Flexor
digitorum profundus
tendon

(b)

Dorsal
interossei

Palmar
interossei

FIGURE 45.4 Intrinsic muscles of the hand: (a) palmar view, (b) dorsal view. (Adapted from Spence, A.P. (1990).
Basic Human Anatomy, 3rd ed. Redwood City, CA: Benjamin Cummings. With permission.)

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TABLE 45.2 Intrinsic Muscles of the Hand and Wrist

Group Name Nerve Function

Thenar muscles Abductor pollicis brevis Median Abducts thumb

Opponens pollicis Median Pulls thumb toward little finger

Flexor pollicis brevis Median Flexes thumb

Adductor pollicis Ulnar Adducts thumb

Hypothenar muscles Palmaris brevis Ulnar Folds skin on ulnar side of palm

Abductor digiti minimi Ulnar Abducts little finger

Flexor digiti minimi Ulnar Flexes little finger

Opponens digiti minimi Ulnar Pulls little finger toward thumb

Midpalmar muscles Lumbricales Median, ulnar Flex proximal phalanges

Dorsal interossei Ulnar Abduct fingers

Palmar inerossei Ulnar Adduct fingers

Source: Adapted from Spence, A.P. (1990). Basic Human Anatomy, 3rd ed. Redwood City, CA: Benjamin Cummings and

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Tubiana, R. (ed.) (1981). The Hand, Vol. 1. Philadelphia, PA: Saunders. With permission.