Muscles of the Forearm, Wrist, and Hand

Flexor Carpi Radialis, Flexor Carpi Ulnaris, Palmaris Longus, and Flexor Digitorum Superficialis.

Muscles that flex the wrist and all originate on the medial epicondyle of the humerus.

Finger flexion

Of all movements of the forearm, wrist, and hand, which is the most powerful.

Pronator Quadratus

Origin: anterior distal quarter of the ulnar shaft. Insertion: anterior distal quarter of the radial shaft. Action: Pronates the arm.

Supinator

Origins: lateral epicondyle of the humerus, proximal 8th of the ulnar shaft. Insertion: proximal lateral radial shaft. Action: supinates the forearm.

Pronator Teres

Origins: medial epicondyle of the humerus, coranoid process of the ulna. Insertion: mid lateral radial shaft. Actions: pronates the arm, flexes the elbow.

Extensors

What muscle group lies on the hairy side of the forearm?

Extensor Digiti Minimi

also known as the tea drinker's muscle, becaue it extends the little finger while you raise the teacup to your lips.

Extensor Digitorum

most superficial muscle of the posterior forearm

Opponens Pollicis

muscle that allows movement of the tip of the thumb to the tip of the pinky.

Extensor Carpi Radialis Brevis

If this muscle becomes inflamed, it is called "tennis elbow".

Flexors

Most powerful movement is flexion and the muscle lies on the "hairless" side of the arm.

Palmaris Longus

This muscle is absent in approximately 10-11% of cadavers.

Retinaculum of the wrist

what causes carpal tunnel