Forearm Muscles

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Pronater Teres (Superficial layer)

Action = Pronates Forearm. Origin = medial epi of humerus

Flexor Carpi Radialis (superficial layer)

Action = Flexes wrist + abducts hand. Origin = Medial epi of humerus

Palmaris Longus (superficial layer)

Action = flexes wrist. Origin = Medial epi of humerus

Flexor carpi ulnaris (superficial layer)

Action = Flexes wrist + adducts hand. Origin = medial epi of humerus

Flexor Digitorum superficialis (intermediate layer)

Action = flexes fingers 2-5. Origin = Medial epi of humerus

Flexor digitorum profundus (deep layer)

Action = flexes fingers 2-5. Origin = ulna

Flexor pollicis longus (Deep layer)

Action = flexes thumb. Origin = radius

Extensor Carpi Radialis Longus

Action = extends wrist + abducts. Origin = lateral supracondylar ridge of humerus

Extensor Carpi Radialis Brevis

Action = extends wrist and abducts hand. Origin = lateral epi of humerus

Extensor digitorum communis

Action = extends fingers 2-5. Origin = lateral epi of humerus

Extensor digiti minimi

Action = extends finger 5. Origin = lateral epi of humerus

Extensor carpi ulnaris

Action = extends wrist + adducts hand. Origin = lateral epi of humerus

Extensor indicis

Action = extends finger 2. Origin = posterior ulna

Abductor Pollicis Longus

Action = abducts thumb. Origin = radius and ulna

Extensor pollicis brevis

action = extends thumb. Origin = radius

Extensor pollicis longus

Action = extends thumb. Origin = ulna

Flexor Retinaculum

Anterior wrist band

Carpal tunnel

Nerves and blood vessels go through here

Palamar Aponeurosis

triangular ligament

Extensor retinaculum

posterior wrist band