Topic 8 - Carpal extensors and supinators of the radioulnar joint

Question 1

M.supinator

Answer 1

O: Lat. epicondyle and lat. collateral lig.
I: Cran. surface of the prox. of the radius
A: Supinate forearm and forefoot - rotates lat.

Question 2

M.brachioradialis

Answer 2

(Just 33% has it)
O: Crista epicondylus lat.
I: Dist. med. of radius
A: Supinates forearm and forefoot - rotates lat.

Question 3

M.extensor carpi radialis

Answer 3

O: Lat. epicondylar crest
I: Dorsal surface of base of Mc.2+3
A: Strongest extensor of the carpus

Question 4

M.extensor carpi ulnaris

Answer 4

O: Lat. epicondyle
I: Lat. aspect of the base of Mc.5 and accessory carpal bone.
A: Supports carpus when extended to bear weight. Also help in flexion, abduction and lat. rotation of the carpal joint - because of the tendon to acc.carpal bone.

Question 5

The muscles

Answer 5

M.supinator
M.brachioradialis
M.ext. carpi radialis
M.ext. carpi ulnaris