The 1st compartment contains abductor pollicis longus and extensor pollicis brevis.
2.
The lateral surface is marked by a flat groove for the tendons of the abductor pollicis longus and extensor pollicis brevis.
3.
The extensor pollicis brevis and flexor pollicis longus allow modern humans to have great manipulative skills and strong flexion in the thumb.
4.
Its lower part is narrow, and covered by the tendons of the abductor pollicis longus muscle and extensor pollicis brevis muscle.
5.
Where it lies upon the abductor pollicis longus and the extensor pollicis brevis, it is accompanied by the dorsal interosseous nerve.
6.
A part of the tendon reaches the trapezium, while another fuses with the tendons of the extensor pollicis brevis and the abductor pollicis brevis.
7.
Other muscles in the forearm also innervated by the radial nerve are supinator, extensor pollicis brevis, extensor pollicis longus, and abductor pollicis longus.
8.
It obliquely crosses the tendons of the extensor pollicis brevis by a triangular interval, the anatomical snuff box in which the radial artery is found.
9.
It also applies an extensor force at the metacarpophalangeal joint together with the extensor pollicis brevis and extends and adducts at the carpometacarpal joint of the thumb.
10.
The extensor pollicis brevis ( EPB ) originates on the ulna distal to the abductor pollicis longus, from the interosseus membrane, and from the dorsal side of the radius.
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