Variation in subscapularis muscle fibres arrangement in Thais.

An arrangement of subscapularis muscle fibres was investigated in 33 male and 15 female Thai cadavers. The muscle was a sheet showing multipennate arrangement. It consisted of upper pinnate fasciculi interdigitating with lower pinnate fasciculi. Each upper and lower pennate fasciculus had ascending and descending intramuscular tendinous septum in the middle respectively. In addition, some descending tendinous septa bifurcated and the lower pennate fasciculus were subdivided into pair pennate fasciculi. New discovery of the bifurcation of some asconding septa and the upper pair pennate fasciculi was recorded.