title: Unmyelinated fibers in the human L4 and L5 ventral roots.
mesh_terms: D001369:Axons / Q000166:cytology; D006801:Humans; D008161:Lumbosacral Region; D008854:Microscopy, Electron; D012583:Schwann Cells; D013126:Spinal Nerve Roots / Q000166:cytology*