Study of motor units and arrangement of myons of human musculus plantaris.

It was seen in ten specimens that their plantaris muscle had different sizes of myons, whicnother were found. The number of motor units of the plantaris was counted in five subjects after transverse section of the muscle and nervous fibers of each of them. Considering the number of motor fibers as 60% in each nerve, the average value of muscle fibers per motor unit was 372, which is quit a small number. The fact led us to think that the plantaris muscle has a very refined function.