![]() ![]() ![]() At the wrist, it splits into four tendons, that pass through the carpal tunnel and attach to the distal phalanges of the four fingers. Attachments: Originates from the ulna and associated interosseous membrane.There are three muscles in the deep anterior forearm: flexor digitorum profundus, flexor pollicis longus, and pronator quadratus. It attaches laterally to the mid-shaft of the radius. Attachments: It has two origins, one from the medial epicondyle, and the other from the coronoid process of the ulna.The lateral border of the pronator teres forms the medial border of the cubital fossa, an anatomical triangle located over the elbow. ![]() Actions: Flexion and abduction at the wrist.Attachments: Originates from the medial epicondyle, attaches to the base of metacarpals II and III.Attachments: Originates from the medial epicondyle, attaches to the flexor retinaculum of the wrist.This muscle is absent in about 15% of the population. Actions: Flexion and adduction at the wrist.The muscle tendon passes into the wrist and attaches to the pisiform bone, hook of hamate, and base of the 5th metacarpal.The humeral head originates from the medial epicondyle of the humerus with the other superficial flexors, whilst the ulnar head originates from the olecranon of the ulna. The flexor carpi ulnaris has two origins.They all originate from a common tendon, which arises from the medial epicondyle of the humerus. The superficial muscles in the anterior compartment are the flexor carpi ulnaris, palmaris longus, flexor carpi radialis and pronator teres. ![]()
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