tarsal depressor muscle prothoracic depressor muscle prothoracic tarsal depressor muscle 43 2022-07-05T13:30:44Z Depressor muscle of the adult prothoracic tarsus that extends along the tibia, medial to the tarsal levator muscle 42. It is composed of 20 to 24 fibers (Soler et al., 2004). FBbt:00058872 fly_anatomy.ontology