Bassett Collection Large Image - Lane Medical Library, Stanford University Medical Center

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Dorsal aspect of right forearm

Origins of deep layer of extensor muscles

1 .	Deep branch of radial nerve
2 .	Supinator muscle (insertion)
3 .	Dorsal interosseous artery
4 .	Abductor pollicis longus muscle (area of origin)
5 .	Radius
6 .	Antebrachial interosseous membrane
7 .	Extensor carpi radialis brevis muscle (tendon)
8 .	Extensor pollicis brevis muscle
9 .	Anterior interosseous artery
10 .	Dorsal interosseous nerve (terminal part)
11 .	Compartment for common extensor digitorum muscle and extensor indicis muscle
12 .	Dorsal carpal ligament
13 .	Compartment for extensor digiti minimi muscle
14 .	Compartment for extensor carpi ulnaris muscle
15 .	Ulna
16 .	Area of origin of extensor indicis muscle
17 .	Area of origin of extensor pollicis longus muscle