Anatomy - Back of forearm

Anatomy of Back of Forearm

1. Anatomy Back of Forearm

2. Muscles There are two groups of muscles at the back of forearm. Superficial Muscle group Deep Muscle group

3. Superficial Muscles There are seven muscles in the superficial group . Anconeus Brachioradialis Extensor carpi radialis longus Extensor carpi radialis brevis Extensor digitorum Extensor digiti minimi Extensor carpi ulnaris

4. 1. Anconeus Origin: Lateral epicondyle of humerus Insertion: Lateral and inferior to olecranon process of ulna

5. Action: Not a prime mover in any joint action; Assists in elbow extension Nerve supply: Radial nerve (C7, C8)

6. 2.Brachioradialis Origin: Lateral supracondylar ridge on the humerus Insertion: Styloid process of the radius

7. Action: Elbow flexion Nerve supply: Radial nerve (C5, C6)

8. 3. Extensor carpi radialis longus Origin: Supracondylar ridge of humerus Insertion: Base of second metacarpal

9. Action: Wrist extension Radial deviation Nerve supply: Radial nerve (C6, C7)

10. 4. Extensor carpi radialis brevis Origin: Lateral epicondyle of humerus Insertion: Base of third metacarpal

11. Action: Wrist extension Nerve supply: Radial nerve ( C6, C7)

12. 5. Extensor digitorum Origin: Lateral epicondyle of the humerus Insertion: Base of distal phalanx of the second through fifth fingers

13. Action: Extends all three joints of the fingers (MCP , PIP, and DIP) Nerve supply: Radial nerve (C6, C7, C8)

14. 6. Extensor digiti minimi Origin: Lateral epicondyle of humerus Insertion: Base of distal phalanx of fifth finger

15. Action: Extends all three joints of fifth finger (MCP , PIP, and DIP) Nerve supply: Radial nerve (C6, C7, C8)

16. 7. Extensor carpi ulnaris Origin: Lateral epicondyle of humerus Insertion: Base of fifth metacarpal

17. Action: Wrist extension, ulnar deviation Nerve supply: Radial nerve (C6, C7, C8 )

18. Deep Muscles There are 5 muscles in the deep muscle group. Supinator Abductor pollicis longus Extensor pollicis brevis Extensor pollicis longus Extensor indicis

19. 1. Supinator Origin: Lateral epicondyle of humerus and adjacent ulna Insertion: Anterior surface of the proximal radius

20. Action: Forearm supination Nerve supply: Radial nerve (C6)

21. 2. Abductor pollicis longus Origin: Posterior radius, interosseous membrane , middle ulna Insertion: Base of the first metacarpal

22. Action: Abducts thumb (CMC) Nerve supply: Radial nerve (C6, C7)

23. 3. Extensor pollicis brevis Origin: Posterior distal radius Insertion: Base of the proximal phalanx of thumb

24. Action: Extends CMC and MCP joints of thumb Nerve supply: Radial nerve (C6, C7)

25. 4. Extensor pollicis longus Origin: Middle posterior ulna and interosseous membrane Insertion: Base of distal phalanx of thumb

26. Action: Extends all three joints of the thumb (CMC , MCP, and IP) Nerve supply: Radial nerve (C6, C7, C8)

27. 5. Extensor indicis Origin: Distal ulna Insertion: Base of distal phalanx of the second finger

28. Action: Extends all three joints of the second finger (MCP, PIP, and DIP) Nerve supply: Radial nerve (C6, C7, C8 )

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