OBJECTIVETo explore the relationship between the distributions of posterior ramus of spinal nerve (PRSN) and locations of acupoint in low back through anatomical observation.

METHODSThe regional anatomy was performed at five corpses to observe the distribution of erector spinae muscle and PRSN in areas ofpoints and back-points in low back.

RESULTSThe T, L, L, Land LPRSN distributed on both sides of the spine; the medial branches of PRSN travelled between spinalis thoracis muscle and longissimus thoracis muscle, while the lateral branches of PRSN travelled between longissimus thoracis muscle and iliocostalis lumborum muscle.

CONCLUSIONS points and back-points in low back are closely associated with PRSN, particularly T, L, L, Land L.