Position

Action

Deltoid

Triceps Biceps

Brachialis and brachioradialis

Flexors of the wrist and fingers

Extensors of the wrist and fingers

Covers the shoulder

Posterior aspect of upper arm Anterior aspect of upper arm Deep to biceps

Many muscles lie in layers on the anterior aspect of the forearm

Many muscles lie in layers on the posterior aspect of the forearm

Three sets of fibres: anterior fibres flex shoulder joint; middle fibres abduct shoulder joint; posterior fibres extend shoulder joint

Extends elbow joint

Flexes elbow joint

Flex elbow joint

Flex wrist and fingers

Extend wrist and fingers

Small muscles of the hand lie in the palm and also form the thenar eminence on the thumb side and the hypothenar eminence on the little-finger side. Other small muscles lie between the metacarpals.

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