Muscles of the Arm!

1

23

45

6

1011 15

13

14

12

7

8

9

16

17

1918

20

2124

22

23

Supina-tor

Pronator Teres

Pronator Quadratus

25

27

26

Muscles Origin Insertion

Biceps Brachii Coracoid process and tuber-cle above glenoid cavity of scapula

Radial tuberosity of radius

Deltoid Acromion process, spine of scapula, and clavicle

Deltoid tuberosity of humerus

Brachialis Anterior shaft of humerus Coronoid process of ulna

Supinator Lateral epicondyle of humerus and crest of ulna

Lateral surface of radius

Pronator teres Medial epicondyle of humerus and coronoid process of ulna

Lateral surface of radius

Brachioradialis Distal lateral end of humerus Lateral surface of radius above styloid process

Extensor carpi radialis longus

Distal end of humerus Base of second metacarpal

Flexor carpi radialis Medial epicondyle of humerus

Base of second and third metacarpals

Palmaris longus Medil epicondyle of humerus Fascia of palm

Flexor carpi ulnaris Medial epicondyle of humerus and olecranon process

Carpal and metacarpal bones

Pronator quadratus Anterior distal end of ulna Anterior distal end of radius

Extensor carpi radialis brevis Lateral epicondyle of humerus

Base of second and third metacarpals

Extensor digitorum Lateral epicondyle of humerus

Posterior surface of pha-langes in fingers 2-5

Muscles Action

Biceps Brachii Flexes forearm at elbow and ro-tates hand laterally

Deltoid Abducts arm, extends or flexes humerus

Brachialis Flexes forearm at elbow

Supinator Rotates forearm laterally

Pronator Teres Rotates forearm medially

Brachioradialis Flexes forearm at elbow

Extensor Carpi Radialis Longus Extends wrist and abducts hand

Flexor Carpi Radialis Flexes and abducts wrist

Palmaris Longus Flexes wrist

Flexor Carpi Ulnaris Flexes and abducts wrist

Pronator Quadratus Rotates forearm medially

Extensor Carpi Radialis Brevis Extends wrist and abducts hand

Extensor Digitorum Extends fingers