Human Anatomy Vol 1

UPPER LIMB

Muscle

Muscles of thenar eminence

Abductor pollicis brevis (Fig. 9.20)

Flexor pollicis brevis

Opponens pollicis

Adductor of thumb

Adductor pollicis

Muscle of medial side of palm

Palmaris brevis

Muscles of hypothenar eminences

Abductor digiti minimi

Flexor digiti minimi

Opponens digiti minimi

Lumbricals (Fi9.9.21)

Lumbricals (4)

Palmar interossei

Palmar (a) (Fig.9.2ab)

Dorsal interossei

Dorsal (4) (Figs 9.23 and9.24a)

Table 9.6: Nenie supply and actions of smafi muscles of the hand

Nerve supply

Median nerve

Median nerve

Median nerve

Deep branch of ulnar nerue which

ends in this muscle

Superficial branch of ulnar nerve

Deep branch of ulnar nerve

Deep branch of ulnar nerve

Deep branch of ulnar nerve

First and second, i.e. lateral two by

median nerve; third and fourth by

deep branch of ulnar nerve

Deep branch of ulnar nerve

Deep branch of ulnar nerve

Actions

Abduction of thumb

Flexes metacarpophalangeal joint of thumb

Pulls thumb medially and forward across palm

(opposes thumb towards the fingers)

Adduction of thumb

Wrinkles skin to improve grip of palm

Abducts little finger

Flexes little finger

Pulls fifth metacarpal fonivard as in cupping the

palm

Flex metacarpophalangeal joints, extend

interphalangeal joints of 2nd-Sth digits

Palmar interossei adduct fingers towards centre

of third digit or middle finger

Dorsal interossei abduct fingers from centre of third

digit. Both palmar and dorsal interossei flex the

metacarpophalangeal joints and extend the

interphalangeal joints

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Fig. 9.26: The planes of movements of the thumb

the lateral side, the arch is completed by superficial

palmar branch of radial artery (Fig.9.32).

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The superficial palmar arch lies deep to the palmaris

Fig.9.25: The planes of movements of the fingers brevis and the palmar aponeurosis. It crosses the palm