Muscles in the arm: origin, insertion and action
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
