Posterior Forearm Flashcards
Brachioradialis
Origin: Lateral sypracondylar ridge of humerus
Insertion: Distal radius
Action: Flexes forearm when in mid-prone position
Nerve: Radial
Extensor carpi radialis longus
Origin: Lateral supracondylar ridge of humerus
Insertion: Base of 2nd metacarpal
Action: Extends and radially deviates (abducts) the wrist
Nerve: Radial
Extensor carpi radialis brevis
Origin: Lateral epicondyle of humerus
Insertion: Base of 2nd and 3rd metacarpal
Action: Extends and abducts the wrist
Nerve: Radial
Extensor digitorum
Origin: Lateral humeral epicondyle of humerus
Insertion: Middle and distal phalanges of 2-5 digits via extensor expansion
Action: Extends digits 2-5 at MP, PIP and DIP joints and extends hand at wrist
Nerve: Radial
Extensor digiti minimi
Origin: Lateral humeral epicondyle of humerus
Insertion: Extensor hood of 5th digit
Action: Extends 5th digit
Nerve: Radial
Extensor Carpi Ulnaris
Origin: Lateral Humeral Epicondyle
Insertion: Base of 5th metacarpal
Action: Extends and adducts wrist
Nerve: Radial
Anconeus
Origin: Lateral humeral epicondyle
Insertion: Olecranon of Ulna
Action: Accessory extensor of elbow (assists triceps); Abducts ulna during pronation
Nerve: Radial
Supinator
Origin: Lateral humeral epicondyle and supinator crest of ulna
Insertion: Lateral upper radius
Action: Supinates forearm and hand
Nerve: Radial
Abductor Pollicis Longus
Origin: Radius, interosseous membrane and ulna
Insertion: Base of 1st metacarpal
Action: Abducts thumb
Nerve: Radial
Extensor pollicis brevis
Origin: Radius and interosseous membrane
Insertion: Proximal phalanx of thumb
Action: Extends proximal phalanx of thumb
Nerve: Radial
Extensor pollicis longus
Origin: Ulna and interosseous membrane
Insertion: Distal phalanx of thumb
Action: Extends distal phalanx of thumb
Nerve: Radial
Extensor Indicis
Origin: Ulna and interosseous membrane
Insertion: Extensor hood of index finger
Action: Extends 2nd digit
Nerve: Radial
