Muscles of the Forearm and Hand

Pronator Teres Origin

Medial epicondyle of humerus; coronoid process of ulna

Pronator Teres Insertion

Lateral surface of radius

Pronator Teres Action

Pronate forearm

Pronator Quadratus Origin

Distal anterior ulna

Pronator Quadratus Insertion

Distal anterior radius

Pronator Quadratus Action

Turn palm downward

Flexor Carpi Radialis Origin

Medial epicondyle of humerus

Flexor Carpi Radialis Insertion

Base of 2nd, 3rd metacarpal bones

Flexor Carpi Radialis Action

Flex and abduct hand

Palmaris Longus Origin

Medial epicondyle of humerus

Palmaris Longus Insertion

Palmar aponeurosis

Palmaris Longus Action

Weak wrist flexion

Flexor Carpi Ulnaris Origin

Medial epicondyle of humerus and ulnar head

Flexor Carpi Ulnaris Insertion

Pisiform, hook of hamate and 5th metacarpal

Flexor Carpi Ulnaris Action

Flex and adduct wrist

Brachioradialis Origin

Proximal ⅔ of lateral supracondylar ridge of humerus

Brachioradialis Insertion

Lateral surface, proximal to styloid process of radius

Brachioradialis Action

Flexes elbow

Flexor Digitorum Superficialis Origin

Humerus, ulna, radius

Flexor Digitorum Superficialis Insertion

Middle phalange of 2-5 digits

Flexor Digitorum Superficialis Action

Flexes phalanges

Flexor Digitorum Profundus Origin

Proximal ¾ of ulna and interosseous membrane

Flexor Digitorum Profundus Insertion

Distal phalanges 2-5 digits

Flexor Digitorum Profundus Action

Flexes phalanges

Flexor Pollicis Longus Origin

Anterior radius and interosseous membrane 

Flexor Pollicis Longus Insertion

Base of distal 1st phalanx

Flexor Pollicis Longus Action

Flexes thumb

Extensor Carpi Radialis Longus Origin

Lateral supracondylar ridge of  humerus

Extensor Carpi Radialis Longus Insertion

Olecranon process on ulna

Extensor Carpi Radialis Longus Action

Extension and adduction of forearm

Extensor Carpi Radialis Brevis Origin

Long head-Inferior to glenoid cavity; Lateral and Medial heads- Posterior surface on humerus

Extensor Carpi Radialis Brevis Insertion

Base of 2nd metacarpal

Extensor Carpi Radialis Brevis Action

Extend and abduct wrist

Extensor Carpi Ulnaris Origin

Lateral epicondyle of humerus and posterior ulna

Extensor Carpi Ulnaris Insertion

Base of 5th metacarpal

Extensor Carpi Ulnaris Action

Extend and adduct wrist

Extensor Digitorum Origin

Lateral epicondyle of humerus

Extensor Digitorum Insertion

2-5 digits

Extensor Digitorum Action

Extend the digits

Extensor Digiti Minimi Origin

Lateral epicondyle of humerus

Extensor Digiti Minimi Insertion

5th digit

Extensor Digiti Minimi Action

Extend 5th digit

Supinator Origin

Lateral epicondyle of humerus, radius, and ulna

Supinator Insertion

Proximal end of radius

Supinator Action

Supination of forearm

Abductor Pollicis Longus Origin

Posterior surface of radius, ulna, and interosseous membrane

Abductor Pollicis Longus Insertion

Base of 1st metacarpal

Abductor Pollicis Longus Action

Abduction and extension of thumb

Extensor Pollicis Brevis Origin

Posterior surface of radius and interosseous membrane

Extensor Pollicis Brevis Insertion

Base of 1st digit

Extensor Pollicis Brevis Action

Extend the 1st digit

Extensor Pollicis Longus Origin

Mid posterior ulna and interosseous membrane

Extensor Pollicis Longus Insertion

Distal phalanx of 1st digit

Extensor Pollicis Longus Action

Abduction and extension 1st digit

Extensor Indicis Origin

Distal posterior ulna and interosseous membrane

Extensor Indicis Insertion

2nd digit

Extensor Indicis Action

Extend 2nd digit