[Relationship between the distribution of spinal nerve posterior ramus and locations of acupoint in low back].

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

METHODS: The regional anatomy was performed at five corpses to observe the distribution of erector spinae muscle and PRSN in areas of Jiaji points and back- shu points in low back.

RESULTS: The T12 , L1 , L2 , L3 and L4 PRSN 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: Jiaji points and back- shu points in low back are closely associated with PRSN, particularly T12 , L1 , L2 , L3 and L4 .