Dorsal aspect of hand

Dorsal interosseous muscles

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Image #109-5
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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