Content
Introduction 0:00
Division of the Forearm Muscles 0:23
Anterior (Flexor) Group 0:40
Pronator Quadratus 1:13
Flexor Digitorum Profundus 1:41
Flexor Pollicis Longus 2:11
Flexor Digitorum Superficialis 2:36
1st Layer 3:14
Lateral Group 4:48
Brachioradialis 5:28
Extensor Carpi Radialis Longus 5:55
Extensor Carpi Radialis Brevis 6:17
Posterior Group 6:42
Abductor Pollicis Longus 7:05
Extensor Pollicis Brevis 7:25
Extensor Pollicis Longus 7:45
Extensor Indicis 8:05
Extensor Digitorum 8:35
Extensor Digiti Minimi 8:57
Extensor Carpi Ulnaris 9:20
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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
musculus 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
musculus extensor pollicis longus
O:
Posterior surface of Ulna
Interosseous membrane
I: Base of distal phalanx of thumb
F: Extension of thumb
Extensor Indicis
musculus extensor indicis
O:
Posterior surface of Ulna
Interosseous membrane
I: Base of middle/distal phalanx of index finger
F: Extension of Index finger (2nd finger)
Extensor Digitorum
musculus 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