It then runs between flexor digitorum superficialis and flexor digitorum profundus muscles and enters the hand through the carpal tunnel.
The extra-calcified elements are created from small, calcified particles that are found in the fibrous part of the flexor digitorum profundus.
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 lumbricals attach in part to the flexor digitorum profundus tendons.
It lies in the same plane as the flexor digitorum profundus.
As the wrist flexes, the flexor digitorum profundus contracts in a proximal direction, drawing the lumbricals along with it.
In some individuals, the lumbricals can be dragged into the carpal tunnel with flexor digitorum profundus contraction.
If the ulnar nerve lesion occurs more proximally (closer to the elbow), the flexor digitorum profundus muscle may also be denervated.
