When used effectively they can facilitate huge gains in forearm strength and lock off strength, mostly in the flexor digitorum profundus and flexor digitorum superficialis muscles of the fore arms.
If the ulnar nerve lesion occurs more proximally (closer to the elbow), the flexor digitorum profundus muscle may also be denervated.
In some individuals, the lumbricals can be dragged into the carpal tunnel with flexor digitorum profundus contraction.
As the wrist flexes, the flexor digitorum profundus contracts in a proximal direction, drawing the lumbricals along with it.
It lies in the same plane as the flexor digitorum profundus.
The lumbricals attach in part to the flexor digitorum profundus tendons.
It passes backward and medialward on the flexor digitorum profundus, behind the flexor digitorum superficialis muscle, and ascends behind the medial epicondyle of the humerus.
The extra-calcified elements are created from small, calcified particles that are found in the fibrous part of the flexor digitorum profundus.
