Dorsal aspect of hand

Dorsal interosseous muscles

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Image #109-5

Dorsal aspect of hand

Dorsal interosseous muscles

The extensor tendons have been cut away and the dorsal interosseous fascia has been removed. A small part of the third dorsal interosseous muscle passes obliquely across the intermetacarpal space to insert on the shaft of the third metacarpal. The first dorsal interosseous muscle has a similar arrangement.

1. Dorsal carpal branch radial artery
2. Extensor carpi radialis longus muscle (tendon of insertion)
3. Extensor pollicis longus muscle (tendon of insertion)
4. Extensor carpi radialis brevis muscle (tendon of insertion)
5. Branches of dorsal metacarpal artery I
6. Dorsal metacarpal artery II
7. Dorsal interosseous muscle I
8. Metacarpal II
9. Dorsal interosseous muscle II
10. Common extensor digitorum muscle (tendon to index finger)
11. Extensor indicis muscle (tendon of insertion)
12. Transverse fibers of extensor expansion
13. Common extensor digitorum muscle (tendons of insertion)
14. Dorsal metacarpal artery III
15. Dorsal interosseous muscle III (left pointer on muscle described in text above)
16. Dorsal interosseous muscle IV
17. Metacarpal V
18. Abductor digiti minimi muscle
19. Position of carpometacarpal articulation
20. Left pointer: Dorsal carpal ligament Right pointer: Compartment for common extensor digitorum muscle and extensor indicis muscle
21. Extensor carpi ulnaris muscle (tendon cut off within compartment)
22. Compartment for extensor digiti minimi muscle