Extensor pollicis brevis muscle

In human anatomy, the extensor pollicis brevis is a skeletal muscle on the dorsal side of the forearm. It lies on the medial side of, and is closely connected with, the abductor pollicis longus.Anatomical snuff boxBones of left forearm. Posterior aspect.Bones of the left hand. Dorsal surface.Tendons of forefinger and vincula tendina.Transverse section across distal ends of radius and ulna.Transverse section across the wrist and digits.The mucous sheaths of the tendons on the back of the wrist.The radial and ulnar arteries.Arteries of the back of the forearm and hand.Extensor carpi radialis brevis muscleExtensor pollicis brevis muscleExtensor pollicis brevis muscleExtensor pollicis brevis muscleExtensor pollicis brevis muscleExtensor pollicis brevis muscleExtensor pollicis brevis muscleExtensor pollicis brevis muscleMuscle of the hand.Posterior view. In human anatomy, the extensor pollicis brevis is a skeletal muscle on the dorsal side of the forearm. It lies on the medial side of, and is closely connected with, the abductor pollicis longus. The extensor pollicis brevis arises from the ulna distal to the abductor pollicis longus, from the interosseous membrane, and from the dorsal surface of the radius. Its direction is similar to that of the abductor pollicis longus, its tendon passing the same groove on the lateral side of the lower end of the radius, to be inserted into the base of the first phalanx of the thumb.