extensor pollicis brevis

Question 1

extensor pollicis brevis origin

Answer 1

middle 1/3 posterior surface of radius & adjacent interosseous membrane

Question 2

extensor pollicis brevis insertion

Answer 2

dorsal surface, base of proximal phalanx of thumb

Question 3

extensor pollicis brevis nerve supply

Answer 3

radial nerve C7, 8

Question 4

extensor pollicis brevis action

Answer 4

extends CMC, MCP of thumb, extends and abducts wrist