Muscles in the arm: origin, insertion and action

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Abductor Pollicis Longus ACTION

Abducts thumb • Extends thumb • Radially deviates (abducts) wrist

Flexor Pollicis Longus ORIGIN

Anterior surface of body of radius • Interosseous membrane

Extensor Pollicis Longus INSERTION

Base of 1st distal phalanx (thumb), dorsal side

Flexor Carpi Radialis INSERTION

Base of 2nd and 3rd metacarpals, palmar side

Extensor Carpi Radialis Longus INSERTION

Base of 2nd metacarpal, dorsal side

Extensor Indicis INSERTION

Base of 2nd proximal phalanx (index finger) and into tendon of extensor digitorum to 2nd digit

Extensor Carpi Radialis Brevis INSERTION

Base of 3rd metacarpal, dorsal side

Extensor Carpi Ulnaris INSERTION

Base of 5th metacarpal, dorsal side

Extensor Digiti Minimi INSERTION

Base of 5th proximal phalanx (little finger), dorsal side

Flexor Pollicis Longus INSERTION

Base of first distal phalanx (thumb), palmar side

Flexor Digitorum Profundus INSERTION

Bases of distal phalanges 2-5, palmar side

Extensor Carpi Radialis Longus ORIGIN

Distal 1/3 of lateral supracondylar ridge of humerus

Extensor Indicis ACTION

Extends joints of index finger

Extensor Digiti Minimi PRIMARY AND SECONDARY ACTION

Extends joints of little finger Secondary Action: • Adducts little finger

Extensor Pollicis Longus ACTION

Extends joints of thumb • Radially deviates (abducts) wrist

Extensor Carpi Radialis Brevis ACTION

Extends wrist • Radially deviates (abducts) wrist

Extensor Carpi Radialis Longus ACTION

Extends wrist • Radially deviates (abducts) wrist

Extensor Carpi Ulnaris ACTION

Extends wrist • Ulnar deviates (adducts) wrist

Flexor Digitorum Profundus ACTION

Flexes distal interphalangeal joints 2-5

Flexor Pollicis Longus ACTION

Flexes joints of thumb

Flexor Digitorum Superficialis ACTION

Flexes proximal interphalangeal joints 2-5

Palmaris Longus Primary Action & Secondary

Flexes wrist Secondary Action: • Slightly flexes elbow • Tenses palmar fascia

Flexor Carpi Ulnaris PRIMARY AND SECONDARY ACTION

Flexes wrist • Ulnar deviates (adducts) wrist Secondary Action: • Slightly flexes elbow

Palmaris Longus INSERTION

Flexor retinaculum • Palmar aponeurosis

Flexor Carpi Ulnaris ORIGIN

Humeral head - medial epicondyle • Ulnar head - medial aspect of olecranon process and proximal 2/3 of posterior border

Flexor Digitorum Superficialis ORIGIN

Humeral head - medial epicondyle and ulnar collateral ligament • Ulnar head - medial aspect of coronoid process • Radial head - proximal ½ of anterior shaft distal to radial tuberosity

Extensor Carpi Radialis Brevis Origin

Lateral epicondyle of humerus

Extensor Digiti Minimi ORIGIN

Lateral epicondyle of humerus

Extensor Digitorum ORIGIN

Lateral epicondyle of humerus

Extensor Carpi Ulnaris ORIGIN

Lateral epicondyle of humerus • Middle 1/3 of posterior border of ulna

Flexor Carpi Radialis ORIGIN

Medial epicondyle of humerus

Palmaris Longus Origin:

Medial epicondyle of humerus

Extensor Pollicis Longus ORIGIN

Middle 1/3 of posterior surface of ulna • Interosseous membrane

Abductor Pollicis Longus ORIGIN

Middle 1/3, posterior surface of • Ulna • Radius • Interosseous membrane

Flexor Carpi Ulnaris INSERTION

On palmar side of: • Pisiform • Hook of hamate • Base of 5th metacarpal

Extensor Indicis ORIGIN

Posertior surface of body of ulna • Interosseous membrane

Flexor Digitorum Profundus ORIGIN

Proximal ¾ of ulna, anterior and medial surfaces • Interosseous membrane

Abductor Pollicis Longus INSERTION

• Base of first metacarpal (thumb), dorsal side

Extensor Digitorum ACTION

• Extends joints of fingers 2-5 • Extends wrist

Flexor Carpi Radialis PRIMARY AND SECONDARY ACTION

• Flexes wrist • Radially deviates (abducts) wrist Secondary Action: - Slightly flexes elbow - Slightly pronates forearm

Extensor Digitorum INSERTION

• Middle and distal phalanges 2-5, dorsal side

Flexor Digitorum Superficialis INSERTION

• Sides of middle phalanges 2-5 via four tendons


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