LUMBRICALS are small muscles that are located in the palm of the hand. They attach from a flexor tendon in the palm, but then move to the dorsal (backside) of the hand to insert into a structure called the extensor expansion. This attachment from the front to the back of the hand allows the unique function of these muscles, which is to flex one joint (the MP joint), but then to extend the others (the IP joints). . . #instituteofhumananatomy #anatomy #anatomylab #anatomyclass #learnanatomy #learn