Muscles of the Forearm & Hand (1)
Nerve Supply to the Palmaris Longus
Median, C7-C8
Nerve Supply to the Flexor Carpi Ulnaris
Ulnar, C7, C8
Nerve Supply to the Pronator Quadratus
anterior interosseous branch of the median nerve; C8, T1
Insertion of the Flexor Carpi Radialis
anterior surfaces of the bases of metacarpals 2 and 3
Origin of the Flexor Carpi Ulnaris
by 2 heads from medial epicondyle of the humerus and medial border of the olecranon process of the ulna
Insertion of the the Extensor Digitorum
by 4 tendons, 1 to each finger; each tendon divides into 3 slips; the middle slip attaches to the dorsal surface of the middle phalanx and the other 2 unite to attach to the dorsal surface of the base base of the distal phalanx
Origin of Extensor Carpi Radialis Brevis
common extensor tendon from lateral epicondyle of humerus
Origin of the Extensor Digitorum
common extensor tendon from the lateral epicondyle of the humerus
Origin of the Flexor Carpi Radialis
common flexor tendon from medial epicondyle of humerus
Origin of the Palmaris Longus
common flexor tendon from the medial epicondyle of the humerus
Origin of Extensor Digiti Minimi
common tendon of the extensor digitorum (lateral epicondyle)
Origin of the Pronator Quadratus
distal 1/4 of anterior ulna
Insertion of the Pronator Quadratus
distal 1/4 of the anterior radius
Action of Extensor Carpi Radialis Longus
extends and radially deviates the hand at the wrist
Action of the Extensor Digiti Minimi
extends proximal phalanx of the little finger at the metacarpophalangeal joint and assists in extension at the wrist; extends the middle and distal phalanges especially when the proximal phalanx is held in flexion
Action of the Extensor Digitorum
extends the phalanges at the interphalangeal joints; continued action extends the metacarpophalangeal and carpometacarpal articulations; assists in extending the wrist
Action of Extensor Carpi Radialis Brevis
extension and radial deviation of the hand at the wrist
Synergists of Extensor Carpi Radialis Longus
extensor carpi radialis brevis & extensor carpi ulnaris (extension); flexor carpi radialis (radial deviation)
Synergists of Extensor Carpi Radialis Brevis
extensor carpi radialis longus & extensor carpi ulnaris (extension); extensor carpi radialis longus and flexor carpi radialis (radial deviation)
Synergists of the Extensor Digiti Minimi
extensor digitorum
Synergists of the Extensor Digitorum
extensor indicis, extensor digiti minimi, lumbricales
Action of the Flexor Carpi Radialis
flexes and radially deviates the hand at the wrist
Action of the Flexor Carpi Ulnaris
flexes and ulnarly deviates the hand at the wrist
Action of the Palmaris Longus
flexes the hand at the wrist
Synergists of the Flexor Carpi Ulnaris
flexor carpi radialis and palmaris longus (flexion); extensor carpi ulnaris (ulnar deviation)
Synergists of the Palmaris Longus
flexor carpi radialis, flexor carpi ulnaris, flexor digitorum sperficialis
Synergists of the Flexor Carpi Radialis
flexor carpi ulnaris and palmaris longus (flexion); extensor carpi radialis longus & brevis (radial deviation)
Insertion of the Palmaris Longus
flexor retinaculum and palmar aponeurosis
Origin of Extensor Carpi Radialis Longus
lower 1/3 of lateral supracondylar ridge and a few fibers from lateral epicondyle
Nerve Supply to the Flexor Carpi Radialis
median nerve, C6, C7
Insertion of the Flexor Carpi Ulnaris
palmar surface of pisiform and hamate carpal bones and base of 5th metacarpal
Nerve Supply to Extensor Carpi Radialis Brevis
posterior interosseous (deep radial), C7, C8
Nerve Supply to the Extensor Digiti Minimi
posterior interosseous (deep radial), C7, C8
Nerve Supply to the Extensor Digitorum
posterior interosseous (deep radial), C7, C8
Insertion of Extensor Carpi Radialis Longus
posterior surface of base of 2nd metacarpal
Insertion of Extensor Carpi Radialis Brevis
posterior surface of the base of metacarpal 3
Action of the Pronator Quadratus
pronates the forearm
Synergists of the Pronator Quadratus
pronator teres
Nerve Supply to Extensor Carpi Radialis Longus
radial, C6, C7
Insertion of Extensor Digiti Minimi
tendon of the extensor digitorum at the proximal phalanx of the little finger and into the dorsal expansion of the finger extensor tendons