Wrist Flexor Group

Brian Lee
Table of Contents

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Superficial Flexor Group

  1. Flexor Carpi Radialis
    • Function: Flexes and abducts the wrist.
    • Origin: Medial epicondyle of the humerus.
    • Insertion: Base of the 2nd and 3rd metacarpals.
  2. Flexor Carpi Ulnaris
    • Function: Flexes and adducts the wrist.
    • Origin: Medial epicondyle of the humerus and the olecranon of the ulna.
    • Insertion: Pisiform, hook of the hamate, and the base of the 5th metacarpal.
  3. Palmaris Longus (may be absent in some individuals)
    • Function: Flexes the wrist and tenses the palmar aponeurosis.
    • Origin: Medial epicondyle of the humerus.
    • Insertion: Palmar aponeurosis and flexor retinaculum.
  4. Flexor Digitorum Superficialis (intermediate layer)
    • Function: Flexes the middle phalanges of fingers 2-5 at the proximal interphalangeal joints and assists in wrist flexion.
    • Origin: Medial epicondyle of the humerus, ulnar collateral ligament, and radius.
    • Insertion: Middle phalanges of fingers 2-5.

Deep Flexor Group

  1. Flexor Digitorum Profundus
    • Function: Flexes the distal phalanges of fingers 2-5 at the distal interphalangeal joints.
    • Origin: Upper three-quarters of the ulna and interosseous membrane.
    • Insertion: Base of the distal phalanges of fingers 2-5.
  2. Flexor Pollicis Longus
    • Function: Flexes the thumb at the interphalangeal joint.
    • Origin: Anterior surface of the radius and interosseous membrane.
    • Insertion: Base of the distal phalanx of the thumb.
  3. Pronator Quadratus
    • Function: Pronates the forearm.
    • Origin: Distal quarter of the anterior ulna.
    • Insertion: Distal quarter of the anterior radius.