Muscular System Appendicular (Lower arm)

What is this muscle?

Flexor Carpi Radialis

What is the origin for Flexor Carpi Radialis?

Medial epicondyle of the humerus through the common tendon

What is the insertion of Flexor Carpi Radialis?

Front of the bases of the second and third metacarpal bones

What is the action of Flexor Carpi Radialis?

Flexes hand, synergist in abduction with extensor carpi radialis longus and brevis

What is this muscle?

Flexor Carpi Ulnaris

What is the origin of Flexor Carpi Ulnaris?

Humeral head - medial epicondyle of the humerus through the common tendon

Ulnar head - medial margin of olecranon process of ulna, posterior border of shaft of the ulna

What is the insertion of Flexor Carpi Ulnaris?

Pisiform bone, hook of the hamate, and base of the fifth metacarpal bone

What is the action of Flexor Carpi Ulnaris?

Flexes hand, synergist in adduction of hand with extensor carpi ulnaris

What is this muscle?

Pronator Teres

What is the origin of Pronator Teres?

Humeral head - Medial supracondylar ridge and medial epicondyle of the humerus

Ulnar head - Medial border of the coronoid process of the ulna

What is the insertion of the Pronator Teres?

Middle of lateral surface of the radius (pronator tuberosity)

What is the action of Pronator Teres?

Pronates and flexes forearm

What is this muscle?

Pronator Quadratus

What is the origin of Pronator Quadratus

Anterior surface of distal part of shaft of ulna

What is the insertion of Pronator Quadratus

Lower portion of anterior surface of shaft of radius, distal part of lateral border of radius

What is the action of Pronator Quadratus

Pronates forearm and hand

What is this muscle?

Palmaris Longus

What is the origin of Pronator Longus?

Medial epicondyle of the humerus through the common tendon

What is the insertion of Palmaris Longus?

Front (central part) of the flexor retinaculum and apex of the palmar aponeurosis

What is the action of Palmaris Longus?

Flexes the hand

What is this muscle?

Flexor Digitorum Superficialis

What is the origin of Flexor Digitorum Superficialis?

Humeroulnar head - Medial epicondyle of the humerus through common tendon, medial margin of the coronoid process of the ulna

Radial head - Anterior surface of shaft of radius

What is the insertion of Flexor Digitorum Superficialis?

Four tendons divide into two slips each, slips insert into the side of the middle phalanges of four fingers

What is the action of Flexor Digitorum Superficialis?

Flexes the middle phalanges of the fingers

What is this muscle?

Extensor Carpi Ulnaris

What is the origin of Extensor Carpi Ulnaris?

Common tendon attached to lateral epicondyle of humerus

What is the insertion of Extensor Carpi Ulnaris?

Posterior surface of base of fifth metacarpal bone

What is the action of Extensor Carpi Ulnaris

Extends hand, synergist in adduction of hand with flexor carpi ulnaris

What is this muscle?

Extensor Carpi Radialis Longus

What is the origin of Extensor Carpi Radialis Longus?

Lower third of lateral supracondylar ridge of humerus

What is the insertion Extensor Carpi Radialis Longus?

Posterior surface of the base of the second metacarpal bone

What is the action of Extensor Carpi Radialis Longus?

Extends hand, synergist in abduction of hand with flexor carpi radialis

What is this muscle?

Extensor Digitorum

What is the origin of Extensor Digitorum?

Common tendon attached to lateral epicondyle of humerus

What is the insertion of Extensor Digitorum?

Lateral and dorsal surfaces of all the phalanges of the four fingers

What is the action of Extensor Digitorum?

Extends the fingers and wrist

What is this muscle?

Abductor Pollicis Longus

What is the origin of Abductor Pollicis Longus?

Posterior surface of shaft of radius, ulna, interosseous membrane

What is the insertion of Abductor Pollicis Longus?

Posterior surface of the base first metacarpal bone

What is the action of Abductor Pollicis Longus

Abducts, laterally rotates, and extends thumb; abducts wrist

What is this muscle?

Supinator

What is the origin of Supinator?

Lateral epicondyle of humerus, lateral ligament of elbow, annular ligament of superior radioulnar joint, supinator crest of ulna

What is the insertion of Supinator?

Dorsal and lateral surfaces of upper third of radius

What is the action of Supinator?

Supinates forearm