Muscles of the Anterior Arm and Forearm€¦ · Muscles of the Anterior Arm and Forearm (Superficial Muscles) ©Sheri Amsel Muscles of the Forearm (Moving Wrist, Hand and Fingers)

Triceps brachii

Brachialis

Flexor carpi radialis

Palmaris longus

Flexor carpi ulnaris

Flexor digitorum superficialis(deep to the above 3 muscles)

Flexor retinaculum

Palmar aponeurosis (fascia)

Deltoid

Biceps brachii

Pronator teres

Brachioradialis

Extensor carpi radialis longus(posterior - just visible here)

Flexor pollicis longus

Pronator quadratus

Thenar muscles of the thumb

Muscles of the Anterior Arm and Forearm(Most Superfical)

©Sheri Amsel www.exploringnature.org

Triceps brachii

Brachialis

Flexor carpi radialis

Palmaris longus

Flexor carpi ulnaris

Flexor digitorum superficialis(deep to the above 3 muscles)

Flexor retinaculum

Palmar aponeurosis (fascia)

Deltoid

Biceps brachii

Pronator teres

Brachioradialis

Extensor carpi radialis longus(posterior - just visible here)

Flexor pollicis longus

Pronator quadratus

Thenar muscles of the thumb

Muscles of the Anterior Arm and Forearm(Most Superfical)


1

5

4

32

2

3

67 8

9

10(deep)

13

12(deep)

(deep)(deeper)

1114

15

Muscles of the Anterior Arm and Forearm (Most Superfical)


Muscles that Cross the Elbow (Moving the Forearm) (Anterior)

1) Deltoid (Visible, but not part of this group as it moves arm from the shoulder)

2) Biceps brachiia. Actions: flexes and supinates forearm (supinate rotates forearm laterally) – these act together for pulling tissue from tissue box, also a minor arm flexorb. Innervation: Musculocutaneous nervec. Origin: from coracoid process and supraglenoid tubercle on scapulad. Insertion: through intertubercular groove of humerus to insert on radial tuberosity

3) Triceps brachii (Visible, but posterior)

4) Brachialisa. Actions: flexes forearmb. Innervation: Musculocutaneous nervec. Origin: from anterior distal humerusd. Insertion: to coronoid process of the ulna

5) Brachioradialisa. Actions: flexes forearm (though doesn’t initiate flexion)b. Innervation: Radial nervec. Origin: from distal humerusd. Insertion: to styloid process of the radius

1

5

4

32

2

3

67 8

9

10(deep)

13

12(deep)

(deep)(deeper)

1114

15

Muscles of the Anterior Arm and Forearm (Superficial Muscles)


Muscles of the Forearm (Moving Wrist, Hand and Fingers) (Anterior Compartment – Flexors)

l. Superficial Muscles

6) Pronator teresa. Actions: pronates (medial rotates) forearm, weak flexor of the forearmb. Innervation: Median nervec. Origin: from medial epicondyle of the humerus and coronoid process of ulnad. Insertion: to the lateral shaft of the radius

7) Flexor carpi radialisa. Actions: flexes wrist, abducts hand, week flexor at elbowb. Innervation: Median nervec. Origin: from medial epicondyle of the humerus d. Insertion: to the base of 2nd and 3rd metacarpals (wrist pulse area)

8) Palmaris longusa. Actions: weak wrist flexorb. Innervation: Median Nervec. Origin: from medial epicondyle of the humerus d. Insertion: to the palmar aponeurosis

9) Flexor carpi ulnarisa. Actions: flexes wrist, adducts handb. Innervation: Ulnar nervec. Origin: from medial epicondyle of humerus and olecranon process of ulnad. Insertion: to the base of the 5th metacarpal and pisiform bone (carpal).

10) Flexor digitorum superficialisa. Actions: flexes wrist, flexes middle phalanges of fingers 2-5 (important finger flexor for fast flexion against resistance)b. Innervation: Medial nervec. Origin: from medial epicondyle of the humerus, coronoid process of ulna, and shaft or radiusd. Insertion: to the four tendons into the middle phalanges of fingers 2-5.

Muscles of the Anterior Arm and Forearm(Deep Muscles)


ll. Deep Muscles

11) Flexor pollicus longusa. Actions: flexes distal phalanx of thumb, weak wrist flexorb. Innervation: Median nervec. Origin: from anterior radiusd. Insertion: to distal phalanx of thumb

12) Flexor digitorum profundusa. Actions: flexes fingers, weak wrist flexor, flexes distal interphalangeal jointb. Innervation: Median nerve does lateral half, Ulnar nerve does medial half of musclec. Origin: from anterior medial surface of ulnad. Insertion: into four tendons of distal phalanges of fingers 2-5

13) Pronator Quadratusa. Actions: pronates forearm (with pronator teres), holds radius and ulna togetherb. Innervation: Median nerve c. Origin: from anterior distal ulnad. Insertion: to distal anterior radius

Not muscles:14) Flexor retinaculum: (also called the transverse carpal ligament and forms the carpal tunnel)

15) Palmar aponeurosis: (fascia that lies over the tendons of hand)

Muscles of the Forearm (Moving Wrist, Hand and Fingers) (Anterior Compartment – Flexors) Continued...

1

5

4

32

2

3

67 8

9

10(deep)

13

12(deep)

(deep)(deeper)

1114

15

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Extensor carpi radialis longus

Flexor digitorum superficialis

Supinator

Flexor pollicus longus

Pronator quadratus

Muscles of the Anterior Arm and Forearm(Deep Muscles)


Humerus

Ulna

Radius

Muscles of the Anterior Arm and Forearm(Deepest Muscles)


Flexor pollicus longus

Pronator quadratus

Supinator

Humerus

Ulna

Radius

Flexor digitorum profundus

Documents

Muscles of the Anterior Arm and Forearm€¦ · Muscles of the Anterior Arm and Forearm (Superficial Muscles) ©Sheri Amsel Muscles of the Forearm (Moving Wrist, Hand and Fingers)