Muscles of the Forearm Crossing the Wrist Joint – Produce movements of the Hand and Fingers at wrist joint

Pronator Teres (A)

A: Pronates forearm; weak forearm flexor

Pronator Teres (O)

O: Humerus (medial epicondyle), Ulna

Pronator Teres (I)

I: Radius

Flexor carpi radialis (A)

A: Flexes and abducts hand (radial deviation)

Palmaris longus (A)

A: Flexes hand

Flexor Carpi Ulnaris (A)

A: Flexes and adducts hand (ulnar deviation)

Flexor retinaculum (not a muscle) (A)

A: Deep fascia that acts like wrist bands and prevents forearm tendons from jumping out

Flexor Digitorum Superficialis (A)

A: Flexes hand and middle phalanx of digits 2 - 5

Flexor Digitorum Profundus (A)

A: Flexes distal phalanx of digits 2 - 5

Pronator Quadratus (A)

A: Pronates forearm

Flexor Pollicis Longus (A)

A: Flexes thumb

Extensor Carpi Radialis Longus (A)

A: Extends and abducts hand (radial deviation)

Extensor Carpi Radialis Brevis (A)

A: Extends and abducts hand (radial deviation)

Extensor Digitorum (communis) (A)

A: Extends digits 2 - 5

Extensor Digiti Minimi (A)

A: Extends digit 5

Extensor Carpi Ulnaris (A)

A: Extends and adducts hand (ulnar deviation)

Extensor retinaculum (not a muscle) (A)

A: Deep fascia that acts like wrist bands and prevents forearm tendons from jumping out

Supinator (A)

A: Supinates forearm

Supinator (O)

O: Humerus, Ulna

Supinator (I)

I: Radius

Abductor Pollicis Longus (A)

A: Abducts thumb (in anterior direction when in anatomical position)

Brevis of Extensor Pollicis (A)

A: Extends thumb (in lateral direction when in anatomical position)

Longus of Extensor Pollicis (A)

A: Extends thumb (in lateral direction when in anatomical position)

Extensor Indicis (A)

A: Extends index finger (pointing)