OBJECTIVETo evaluate the anatomical division within latissimus dorsi and its electromyographic change as shoulder articulation movement.

METHODSUsing anatomical observation, projection of trophic vessel and nerve of latissimus dorsi was marked in the surface of skin. Electromyographic assessment of different area of latissimus dorsi was measured.

RESULTSThe latissimus dorsi was mainly supplied by thoracodorsal and its interior and external branches. The latissimus dorsi can be divided three area based on these anatomical result. Electromyographic amplitude in the three areas of muscle are different.

CONCLUSIONLastissimus dorsi can be divided into three areas by thoracodorsal vessel and nerve. The third area fibres were utilized preferentially when subjects performed six kinds of movements of the shoulder joint.