BIomechanics Final question #9

Which muscle is the most direct antagonist to the flexor carpi ulnaris?

The extensor carpi radialis brevis or the extensor pollicis longus are the most direct antagonists to the flexor carpi ulnaris because it will keep the flexor carpi ulnaris from too much ulnar deviation.

Which muscle has the longest moment arm for ulnar deviation torque

The extensor carpi ulnaris has the longest moment arm for ulnar deviation torque because of its long IMA on the ulnar side from the AoR.

Which muscle would produce the greatest flexion torque at the wrist: the flexor carpi radialis or the flexor digitorum superficialis? Do you need to consider any other factors not seen in the picture?

the flexor digitorum superficialis: they have same IMA but FDS has a greater cross-sectional area. You need to consider the distal attachments of the muscles that are not seen in the picture