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FIGURE 7.50 Primary extensors of the wrist (right fore-
arm, posterior view).FIGURE 7.49 Primary flexors of the wrist (right forearm,
anterior view).TABLE 7.8 Summary of Attachments and Primary Actions of Extrinsic Muscles of the Wrist and HandMuscle Proximal attachment(s) Distal attachment(s) Primary action(s)
Muscles of the wrist
Flexor carpi radialis
(FLEK-sor KAR-pee ra-dee-A-lis)Medial epicondyle of
humerusBase of 2nd and 3rd
metacarpalWrist flexion
Wrist radial deviation
Flexor carpi ulnaris
(FLEK-sor KAR-pee ul-NA-ris)Humeral head: medial
epicondyle of humerus
Ulnar head: olecranon
and posterior border of
ulnaPisiform, hamate, and
5th metacarpalWrist flexion
Wrist ulnar deviationPalmaris longus
(pahl-MA-ris LON-gus)Medial epicondyle of
humerusDistal flexor retinaculum
and palmar aponeurosisWrist flexionExtensor carpi radialis longus
(ek-STEN-sor KAR-pee ra-dee-A-lis LON-gus)Lateral supracondylar
ridge of humerusBase of 2nd metacarpal Wrist extension
Wrist radial deviation
Extensor carpi radialis brevis
(ek-STEN-sor KAR-pee ra-dee-A-lis BRE-vis)Lateral epicondyle of
humerusBase of 3rd metacarpal Wrist extension
Wrist radial deviation
Extensor carpi ulnaris
(ek-STEN-sor KAR-pee ul-NA-ris)Lateral epicondyle of
humerus and posterior
ulnaBase of 5th metacarpal Wrist extension
Wrist ulnar deviation