Muscles of the Forearm (Division, Origin, Insertion, Function)
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Content
0:00 Introduction
0:23 Division of the Forearm Muscles
0:40 Anterior (Flexor) Group
1:13 Pronator Quadratus
1:41 Flexor Digitorum Profundus
2:11 Flexor Pollicis Longus
2:36 Flexor Digitorum Superficialis
3:14 1st Layer
4:48 Lateral Group
5:28 Brachioradialis
5:55 Extensor Carpi Radialis Longus
6:17 Extensor Carpi Radialis Brevis
6:42 Posterior Group
7:05 Abductor Pollicis Longus
7:25 Extensor Pollicis Brevis
7:45 Extensor Pollicis Longus
8:05 Extensor Indicis
8:35 Extensor Digitorum
8:57 Extensor Digiti Minimi
9:20 Extensor Carpi Ulnaris
Muscles of the forearm
Anterior (Flexor) group
Lateral (Radial) group
Posterior (Extensor) group
Anterior (Flexor) group
1st Layer
○ Palmaris Longus
○ Flexor Carpi Radialis
○ Pronator Teres
○ Flexor Carpi Ulnaris
2nd Layer
○ Flexor Digitorum Superficialis
3rd Layer
○ Flexor Digitorum Profundus
○ Flexor Pollicis Longus
4th Layer
○ Pronator Quadratus
Pronator Quadratus
musculus pronator quadratus
O: Anterior surface of Ulna
I: Anterior surface of Radius
F: Pronation of forearm
Flexor Digitorum Profundus
Musculus flexor digitorum profundus
O: Anterior surface of Ulna
I: Base of the distal phalanges (2-5 finger)
basis phalangis distalis (II-V)
F:
Flexion of 2-5th fingers at
metacarpophalangeal and
interphalangeal joints
Accessory flexion of hand
Flexor Pollicis Longus
musculus flexor pollicis longus
O: Anterior surface of Radius
I: Base of the distal phalanges of the thumb
basis phalangis distalis pollicis
F: Flexion of thumb at
metacarpophalangeal and
interphalangeal joints
Accessory flexion of hand
Flexor Digitorum Superficialis
musculus flexor digitorum superficialis
O:
Medial epicondyle of humerus
Ulna
Anterior surface of radius
I: Base of the middle phalanges of 2-5th fingers
basis phalangis mediale II-V
F:
Flexion of 2-5 fingers at
metacarpophalangeal and proximal
interphalangeal joints
Accessory flexion of hand
Pronator Teres
musculus pronator teres
I: Anterolateral surface of Radius
Flexor Carpi Radialis
musculus flexor carpi radialis
I: Base of 2nd and 3rd metacarpal
Palmaris Longus
musculus palmaris longus
I: Palmar Aponeurosis
aponeurosis palmaris
Flexor Carpi Ulnaris
musculus flexor carpi ulnaris
I:
Pisiform
Hamatum and
base of 5th metacarpal
Lateral (Radial) group
Superficial Layer
○ Brachioradialis
○ Extensor Carpi Radialis Longus
○ Extensor Carpi Radialis Brevis
Deep Layer
Supinator
Supinator
musculus supinator
O:
Lateral Epicondyle
Radial Collateral Ligament
Ulna
I: Lateral Surface of Radius
F: Supination of the forearm
Brachioradialis
musculus brachioradialis
O: Lateral margin of humerus
I: Radius above Styloid Process
F:
Supination/Pronation
Flexion of forearm
Stabilises elbow joint
Extensor Carpi Radialis Longus
musculus extensor carpi radialis longus
O: Lateral margin + Lateral Epicondyle of Humerus
I: Base of 2nd metacarpal
basis ossis metacarpalis II
F:
Abduction of hand
Extension of hand
Extensor Carpi Radialis Brevis
musculus extensor carpi radialis brevis
O: Lateral Epicondyle of Humerus
I: Base of 3nd metacarpal
basis ossis metacarpalis III
F:
Abduction of hand
Extension of hand
Posterior (Extensor) group
Superficial Layer
○ Extensor Digitorum
○ Extensor Digiti Minimi
○ Extensor Carpi Ulnaris
Deep Layer
○ Abductor Pollicis Longus
○ Extensor Pollicis Brevis
○ Extensor Pollicis Longus
○ Extensor Indicis
Abductor Pollicis Longus
musculus abductor pollicis longus
O:
Posterior surface of Ulna/Radius
Interosseous membrane
I: Base of 1st metacarpal
F: Abduction of thumb
Extensor Pollicis Brevis
O:
Posterior surface of Radius
Interosseous membrane
I: Base of proximal phalanx of thumb
F: Extension and abduction of thumb
Extensor Pollicis Longus
O:
Posterior surface of Ulna
Interosseous membrane
I: Base of distal phalanx of thumb
F: Extension of thumb
Extensor Indicis
O:
Posterior surface of Ulna
Interosseous membrane
I: Base of middle/distal phalanx of index finger
F: Extension of Index finger
Extensor Digitorum
O: Lateral Epicondyle of Humerus
I: Base of middle and distal phalanges of 2-5th fingers
F:Abduction of Fingers
Extension of hand
Extensor Digiti Minimi
musuclus extensor digiti minimi
O: Lateral Epicondyle of Humerus
I: Base of middle and distal phalanges of 5th fingers
F:Extension of 5th finger
Extensor Carpi Ulnaris
musculus extensor carpi ulnaris
O:
Lateral Epicondyle of Humerus
Posterior surface of Ulna
I: Base of 5th metacarpal bone (medial side)
basis ossis metacarpalis V
F:Extension of hand
Adduction of hand