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

Round Pronator Muscle1. 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

Carpal Radial Flexor Muscle2. 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)

 

3Long Palmar Muscle. 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

 

 

 

Ulnar Flexor Carpal Muscle4. 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

Superficial Flexor Muscles of the Fingers1. 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

Deep Flexor Finger Muscle1. 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

 

 

Thumb Flexor Muscle2. 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

Square Pronator Muscle1. 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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RFinger Extender Muscle Later 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

5th Finger Extender Muscle2. 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

 

 

 

 

Ulnar Carpal Extender Muscle3. 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)

 

 

 

Ancestral Muscle4. 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

Thumb Long Abductor Muscle1. 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

 

 

 

Thumb Extender Short Muscle2. 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

 

 

 

Thumb Extender Muscle3. 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

 

 

 

 


2nd Finger Extender Muscle
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

Brachioradialis muscle1. 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

 

 

 

 

Long Radial Carpal Extender Muscle2. 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)

 

 

 

Short Radial Carpal Extender Muscle

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

 

 

 

 

 

4Supinator Muscle. 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
 
Forearm Muscles - Anterior View - Superficial Dissection
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
Forearm Muscles
Rear View & #8211; Superficial Dissection
 Forearm Muscles - Posterior View - Superficial Dissection
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
Forearm Muscles
Rear View & #8211; Deep Dissection
 
Forearm Muscles - Posterior View - Deep Dissection
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
Forearm Muscles
Rotators
 
Forearm Muscles - Anterior View - Rotators
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
Forearm Muscles
Previous View & #8211; Flexors
 Forearm Muscles - Anterior View - Flexors
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
Forearm Muscles
Previous View & #8211; Flexors
 Forearm Muscles - Anterior View - Flexors
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
Forearm Muscles
Previous View & #8211; Flexors
 Forearm Muscles - Anterior View - Flexors
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
Forearm Muscles
Rear View & #8211; Extenders
 Forearm Muscles - Posterior View - Extenders
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
Forearm Muscles
Rear View & #8211; Extenders
 Forearm Muscles - Posterior View - Extenders
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.

 

Superior Member
Shoulder

Arm

Hand

 

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