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Neurones in the dorsal root ganglia of T13, L1 and L2 innervate the dorsal portion of lower lumbar discs in rats

A STUDY USING DiI, AN ANTEROGRADE NEUROTRACER

¹ Department of Orthopaedic Surgery
² Third Department of Anatomy, School of Medicine, Chiba University, 1-8-1 Inohana Chuo-ku, Chiba 260-8677, Japan.

Correspondence should be sent to Dr S. Ohtori.

Based on a study using a retrograde neurotracer, we have previously found that the dorsal portion of the L5/6 disc in the rat is multisegmentally innervated by dorsal root ganglia (DRG) from the level of T13 to L6, and that sensory nerve fibres from DRG of T13, L1 and L2 pass through the paravertebral sympathetic trunks. In this study in newborn rats, we injected crystals of 1,1'-dioctadecyl-3,3,3',3'-tetramethylinedocarbocyanine perchlorate (DiI) into the DRG of T13, L1 and L2 and showed DiI-labelled sensory nerve fibres in the dorsal portion of the discs from the level of T13/L1 to L5/6. Our results show that the dorsal portion of the lumbar discs is innervated by the DRG from levels T13 to L2.

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