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BMS 301 (47)

Muscles of the forearm, wrist, digits

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Biomedical Science
BMS 301
Mark Frasier

3 December Flexors primarily arise from the medial epicondyle of the humerus – median nerve Extensors arise from the lateral epicondyle of the humerus – radial nerve Muscles that act on forearm (radioulnar joint) Brachioradialis Radial nerve Elbow flexion, supination Pronator teres Medial epicondyle → promixal radius Median nerve Supinator Lateral epicondyle → proximal radius Radial nerve Pronator quadratus Ulna → distal radius Median nerve Pronator teres and supinator have same distal attachment (in radius) Muscles that act on wrist (radiocarpal joint) Flexor carpi radialis Medial epicondyle of humerus → 2 metacarpal Abduct, flex wrist Median nerve Flexor carpi ulnaris Medial epicondyle of humerus → pisiform bone Adduct, flex wrist Palmaris longus Medial epicondyle of humerus → palmar aponeuroses Small muscle belly, long tendon Flex wrist Extensor carpi radialis longus Lateral epicondyle of humerus → 2 metacarpal Extends, abduct wrist Radial nerve Extensor carpi radialis brevis Deep to extensor carpi radialis longus Lateral epicondyle of humerus → 3 metacarpal Extend, abduct wrist Radial nerve Extensor carpi ulnaris th Lateral epicondyle of humerus → 5 metacarpal Extend, adduct wrist Radial n
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