On the Arterial Supply in the Human Peroneus Brevis Muscle

Abstract

As a series of studies of the arterial supply in the human muscle in our laboratory. In this paper, peroneus brevis muscle of ten Japanese adults' bodies with twenty side cases are examined to explore the origin of nutrient arteries, the branching condition and the distribution area in this muscle. 1) We classify this muscle into the following types by the distribution areas of artery. Type I-a : the branch of A. tibialis anterior (Ta) distributes in the upper portion, the branches from Ta and A. peronea (Pe) distribute in the middle portion and branches of Rr. malleolares laterales (Ml) and A. tibialis posterior propria (Tpp, SATO・1984) distribute in the lower portion of this muscle, (10%). Type II-a : Tpp lacks from Type I-a, (65%). Type III-a : Tpp and Ta lack from Type I-a, (10%). Type I-b : Ml lacks from Type I-a, (10%). Type II-b : Ml and Tpp lack from Type I-a, (5%). Type III-b : Ml, Tpp and Ta lack from Type I-a, (0%). 2) Pe has the largest distribution area of branch from artery, Ta has the second largest one and Tpp has the smallest one and highest frequencies of all numbers of arterial supply is six (40%). The frequencies of distribution of arterial supplies as common trunk in both peroneal muscles are observed that Pe has 19 cases and Ta has 15 cases. 3) The nerve (muscular branch arise from the superficicial peroneal nerve) of this muscle is branched into two branches, Ramus superior (RS) and Ramus inferior (RI). RS is distributed muscular bundles of the upper and the middle portions, while RI is distributed only the lower portion. In addition, the variational cases (M. peroneus digiti quinti, Wood) which inserted tendon extends and reaches little toe are observed in 14 cases (70%).