The 1st compartment contains abductor pollicis longus and extensor pollicis brevis.
2.
The 3rd compartment contains extensor pollicis longus.
3.
If necessary, the extensor pollicis longus and the flexor pollicis longus are reattached to centralize their course.
4.
The lateral surface is marked by a flat groove for the tendons of the abductor pollicis longus and extensor pollicis brevis.
5.
It was also identified as a slip of the extensor indicis proprius to the extensor pollicis longus in an Indian cadaver.
6.
The extensor pollicis brevis and flexor pollicis longus allow modern humans to have great manipulative skills and strong flexion in the thumb.
7.
Its lower part is narrow, and covered by the tendons of the abductor pollicis longus muscle and extensor pollicis brevis muscle.
8.
Where it lies upon the abductor pollicis longus and the extensor pollicis brevis, it is accompanied by the dorsal interosseous nerve.
9.
A part of the tendon reaches the trapezium, while another fuses with the tendons of the extensor pollicis brevis and the abductor pollicis brevis.
10.
Other muscles in the forearm also innervated by the radial nerve are supinator, extensor pollicis brevis, extensor pollicis longus, and abductor pollicis longus.
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