抄録
Among abnormities of muscles of the neck, the one of m. omohyoideus seems to occur with more fyequency. Several reports of the abnormity are also available in our country. In the course of dissection practice in the year 1954 we have found one of the rarest abnormity of m. omohyoideus in one of 13 corpses examined (7.7%) The corpse was of a 49-year-old male in which m. omohyoideus and m. sternohyoideus in the right half of the body were normally situated, bnt in the lower belly of m. omohyoideus a small ligament made its appearance near the muscle origin. The ligament proceeded along lowere and inner side of the lower belly in upper and inner direction, gradually dissociating from the belly to unite with m. sternohyoideus at a small distance upper from the middle of its outer margin. The muscle fibers were indistinguishably mixed with the fibers of upper part of m. sternohyoideus, and proceeding upward they reached corpus ossis hyoidis. From these observation it seems reasonable that the muscle be named as m. omohyoideus accessorius. It may as well be mentioned that Mr. Yamada has already reported two case of m. omohyoideus accessorius from 125 corpses of Japanese infant and foetus examined by him.
