Forearm Flexor Muscles - Origins, Insertions, and Actions, with Video Presentation

Posted on 25 Oct 2015 22:12

These videos were produced to help students of human anatomy at Modesto Junior College study their anatomical models.

They are done with models showing the muscular structure of the arm.

The following two videos present an overview of the major flexor muscles of the forearm, which are the muscles of the anterior compartment. These muscles not only are responsible for flexion of the wrist, but are also the extrinsic muscles of the hand, responsible for much its gripping strength.

Each video is followed by information on the origin, insertion, and actions of each muscle covered in the video.

Forearm Flexor Muscles Video Part 1

Pronator Teres muscle

Origin: humeral head: medial epicondyle of humerus (common flexor tendon),
ulnar head: coronoid process of ulna

Insertion: radius

Action: pronation of forearm, flexion of elbow

Flexor Carpi Radialis

Origin: medial epicondyle of the humerus

Insertion: Base of the second and third metacarpals, anterior palmar surface

Action: Flexion of wrist, Abduction of Wrist, flexion of elbow (weak)

Palmarus Longus

Origin: medial epicondyle of the humerus

Insertion: palmar aponneurosis of the second, third, fourth, and fifth metacarpals

Action: flexion of the wrist, weak flexion of the elbow

Flexor Digitorim Superficialis

Origin: medial epicondyle fo the humerus, ulnar head: meadial coronoid process, radial head: upper two-thirds of anterior border of radius

Insertion: middle phalanx of the four fingers

Action: flexion of fingers at metacarpophalangeal and proximal interphalangeal joints, flexion of the wrist, weak flexion of elbow

Flexor Carpi Ulnaris

Action: medial epicondyle of humerus, posterior aspect of proximal ulna

Insertion: pisiform, hamate, and base of fifth metacarpal (palmar surface)

Action: flexion of wrist, adduction of wrist (with extensor carpi ulnaris) weak flexion of elbow

Forearm Flexor Muscles Part 2

Flexor Digitorum Profundus

Origin: proximal three-fourths of the anterior and medial ulna

Insertion: base of distal phalanxes of the four fingers

Action: flexion of the four fingers at the metacarpophalangeal, proximal interphalangeal, and distal interphalgeal joints, flexion of the wrist

Flexor Pollicis Longus

Origin: base of distal phalanx of thumb, middle anterior surface of radius and anterior medial border of ulna just distal to coronoid process

Insertion: base of distal phalanx of thumb, palmar surface

Action: flexion of thumb, carpometacarpal, metacarpophalangeal, and interphalangeal joints, flexion of wrist


Carpal bones: bones of the wrist

Metacarpal bones: the long bones of the hands

Palmar: (palmar surface or palmar aspect) pertaining to the palm of the hand. The "palmar aspect" of the forearm is the surface of the forearm that corresponds with the palm of the hand, for instance.

Phalanx (sg.) or Phalanges (pl.): bones of the thumb, fingers, and toes distal to the metacarpal bones

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This page created 25 Oct 2015 22:12
Last updated 29 Nov 2017 22:34

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