Forearm Muscles

MUSCLES FOREWORD

The muscles of the Forearm are divided into 3 regions:

Previous Region
Lateral Region
Later Region

Previous Region

Later Region

1st layer
Pronator Round
Radial Carpal Flexor
Palmar Long
Ulnar Carpal Flexor

2nd layer

Superficial Finger Flexor

3rd layer

Deep Finger Flexor
Thumb Long Flexor

4th layer

Square Pronator

Surface layer

Finger Extender
5th Finger Extender
Ulnar Carpal Extender
Anconeous

Deep layer

Thumb Long Abductor
Thumb Short Extender
Thumb Long Extender
2nd Finger Extender (Index)

Lateral Region

Brachioradialis
Long Radial Carpal Extender
Short Radial Carpal Extender
Supinador

Previous Region & #8211; 1st layer

1. ROUND PRONATOR

Proximal Insertion: Medial humeral epicondyle and coronoid process of the ulna

Distal Insertion: Lateral face of the middle 1/3 of the radius shaft
Innervation: Median Nerve (C6 & #8211; C7)
Action: Forearm Pronation and Elbow Flexion Assist

2. RADIAL CARPLE FLEXOR

Proximal Insertion: Medial epicondyle (epitrochlea)
Distal Insertion: Anterior face of the 2nd metacarpal
Innervation: Median Nerve (C6 and C7)
Action: Wrist Flexion and Hand Abduction (radial deviation)

3. PALMAR LONG

Proximal Insertion: Medial Epicondyle

Distal Insertion: Palmar aponeurosis and flexor retinaculum
Innervation: Median Nerve (C6 & #8211; C8)
Action: Wrist flexion, palmar aponeurosis tension and flexor retinaculum

4. ULNAR CARPLE FLEXOR

Proximal Insertion: Medial epicondyle and olecranon

Distal Insertion: Pisiform bone, hamate and 5th metacarpal
Innervation: Ulnar Nerve (C7 & #8211; T1)
Action: Wrist Flexion and Hand Adduction (ulnar deviation)

Previous Region & #8211; 2nd layer

1. FINGER FLEXOR OF FINGERS

Proximal Insertion: Medial epicondyle, ulna coronoid process and ulnar collateral ligament

Distal Insertion: Anterior face of the middle phalanx of the 2nd to 5th fingers
Innervation: Median Nerve (C7 and T1)
Action: Wrist Flexion and IFP & #8211; 2nd to 5th Fingers

Previous Region & #8211; 3rd layer

1. DEEP FINGER FLEXOR

Proximal Insertion: Anterior face of proximal da ulna and radius and interosseous membrane

Distal Insertion: Anterior face of distal phalanx of 2nd to 5th fingers
Innervation: Median Nerve (C8 & #8211; T1): 2nd and 3rd fingers. Ulnar Nerve (C8 & #8211; T1): 4th and 5th fingers
Action: Wrist Flexion, IFP and IFD of 2nd, 3rd, 4th and 5th Fingers

2. THONG LONG FLEXOR

Proximal Insertion: Anterior aspect of the radius, interosseous membrane, coronoid process of the ulna and medial epicondyle of the humerus.

Distal Insertion: Distal Phalanx of the Thumb
Innervation: Median Nerve (C8 and T1)
Action: Thumb IF Flexion

Rprevious egion & #8211;4th layer

1. SQUARE PRONATOR

Proximal Insertion: ¼ of anterior aspect of ulna
Distal Insertion: ¼ of the front face of the radio
Innervation: Median Nerve (C8)
Action: Pronation

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RLater Region & #8211; Surface layer

1. FINGER EXTENDER

Proximal Insertion: Lateral humeral epicondyle
Distal Insertion: Middle and distal phalanges of the 2nd to 5th fingers
Innervation: Radial Nerve (C7 & #8211; C8)
Action: Wrist Extension, MF, IFP and IFD from 2nd to 5th Fingers

2. 5TH FINGER EXTENDER (MINIMUM)

Proximal Insertion: Lateral humeral epicondyle
Distal Insertion: Tendon of the common extensor to the 5th finger
Innervation: Radial Nerve (C7 & #8211; C8)
Action: Extension of the 5th finger

3. ULNAR Carpal Extender

Proximal Insertion: Lateral humeral epicondyle
Distal Insertion: Base of the 5th metacarpal
Innervation: Radial Nerve (C6 & #8211; C8)
Action: Wrist Extension and Hand Adduction (ulnar deviation)

4. ANCONE

Proximal Insertion: Lateral humeral epicondyle
Distal Insertion: Ulecran olecranon and proximal ¼ of posterior surface of ulna diaphysis
Innervation: Radial Nerve (C7 and C8)
Action: Elbow Extension

Posterior Region & #8211; Deep layer

1. LONG THINKING ABDUCER

Proximal Insertion: Posterior face of the radius and ulna and interosseous membrane
Distal Insertion: 1st metacarpal
Innervation: Radial Nerve (C7 & #8211; C8)
Action: Abduction of the Hand and Thumb

2. THUMB SHORT EXTENSOR

Proximal Insertion: Radius posterior face and interosseous membrane
Distal Insertion: Dorsal face of proximal phalanx of thumb
Innervation: Radial Nerve (C7 & #8211; C8)
Action: Thumb Extension

3. THONG LONG EXTENDER

Proximal Insertion: Posterior face of the middle 1/3 of the ulna and interosseous membrane
Distal Insertion: Distal Phalanx of the Thumb
Innervation: Radial Nerve (C7 & #8211; C8)
Action: Thumb Extension

4. 2nd FINGER EXTENDER (INDEX)

Proximal Insertion: Posterior face of ulna diaphysis and interosseous membrane
Distal Insertion: Tendon of the common extensor of the 2nd finger
Innervation: Radial Nerve (C7 & #8211; C8)
Action: 2nd Finger Extension

Forearm & #8211; Lateral Region

1. BRAQUIORRADIAL

Proximal Insertion: 2/3 proximal to the lateral supracondylar ridge of the humerus
Distal Insertion: Radio styloid process
Innervation: Radial Nerve (C5 and C6)
Action: Elbow Flexion, Forearm Pronation and Supination to Neutral Point

2. LONG RADIAL Carpal Extender

Proximal Insertion: Lateral face of distal 1/3 of supracondylar humerus crest
Distal Insertion: Posterior face of the 2nd metacarpal
Innervation: Radial Nerve (C6 and C7)
Action: Wrist Extension and Hand Abduction (radial deviation)

3. SHORT RADIAL Carpal Extender

Proximal Insertion: Lateral humeral epicondyle
Distal Insertion: Posterior face of the 3rd metacarpal
Innervation: Radial Nerve (C7 & #8211; C8)
Action: Wrist Extension

4. SUPINATOR

Proximal Insertion: Lateral humeral epicondyle and radial collateral ligament
Distal Insertion: Lateral and proximal 1/3 face of radius diaphysis
Innervation: Radial Nerve (C6 and C7)
Action: Forearm Supination

Forearm Muscles
Previous View & #8211; Superficial Dissection