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Extensor Carpi ulnaris
Origin: lateral epicondyle of humerus, posterior border of ulna.
Insertion: Dorsal base of fifth metacarpal bone
Innervation: Posterior interosseous branch of radial nerve C7-C8
Action: Extends and addicts hand
Flexor Carpi Ulnaris
Origin: medial epicondyle of humerus, olecranon and posterior border of ulna.
Insertion: Base of fifth metacarpal bone, Pisiform hamate hook.
Innervation: Ulnar nerve C7-T1
Action: Flexes and adducts hand
Extensor digitorum
Origin: Lateral epicondyle of humerus
Insertion: Extensor dorsal expansions of 2nd-5th digits.
Innervation: Posterior interosseous branch of radial nerve C7-C8
Action: Extends 2nd to 5th digits and extends hand
Supinator
Origin: lateral epicondyle of humerus and supinator crest of ulna
Insertion: anterior, posterior and lateral surface of radius
Innervation: Deep branch of radial nerve C6-C7
Action: Spinates forarm
Extensor pollicis brevis
Origin: Posterior surface of radius and interosseous membrane
Insertion: dorsal base of 1st proximal phalanx
Innervation: Posterior interosseous branch of radial nerve C7-C8
Action: Extends 1st proximal phalanx
Anconeus
Origin: lateral epicondyle of humerus
Insertion: 1. olecranon 2. posterior surface of ulna
Innervation: Radial nerve C6-T1
Action: Abducts ulna during pronation
Origin: posterior surface of ulna.
Insertion: extensor dorsal expansion of 2nd digit.
Innervation: posterior interosseous brach of radial nerve
Action: Helps to extend the hand and extends 2nd digit.
Origin: lateral epicondyle of humerus
Insertion. dorsal base of 3rd metacarpal
Innervation: deep branch of radial nerve C7-C8
Action: Extends and abducts arm
pronator teres
Origin: medial epicondyle of humerus and coronoid process
Insertion: midpoint of lateral surface of radius
Innervation: median nerve C6-C7
Action: Pronates and flexes forearm.
Extensor Digiti Minimi
Origin: lateral epicondyle of humerus
Insertion: Extensor dorsal expansion of 5th digit
Innervation: Posterior interosseous branch of radial nerve C7-C8
Action: Extends 5th digit
Extensor pollicis longus
Origin: Posterior surface of ulna and interosseous membrane
Insertion: dorsal base of 1st distal phalanx
Innervation: Posterior interosseous branch of radial nerve C7-C8
Action: Extends distal phalanx of 1st digit
Origin: Posterior surface of ulna, posterior surface of radius and interosseous membrane.
Insertion: base of 1st metacarpal
Innervation: posterior interosseous branch of radial nerve C7-C8
Action: Abducts and extends 1st digit
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