Segmental formation of the main nerves of the sacral plexus

The study of segmental innervation may be practical interest, as pathological processes involving organs and tissues can caused by damage to both peripheral individual nerves. Also, the occurrence a condition pelvic limb structures associated with various injuries, spinal cord, roots nerves sacral spine. aim experimental research was formation main plexus – n. ischiadicus, tibialis, peroneus communis in cats. Unilateral extravertebral ganglioectomy lumbosacral segments L 4, L5, L6, L7, S1, S2 performed for study. Samples were examined polarized light detect signs Wallerian's degeneration at x400 magnification. This method allows you easily distinguish degenerated nerve fibers different stages from normal. micromorphology initial is characterized uneven thickening fibers, smoothing Ranvier nodes, dilated Schmidt-Lanterman notches, an increasein number myelin segments. At later degeneration, following are observed: edema significant sheath, fiber contours, ovoids fragmentary glow myelin. Statistical analysis results using Student's t-test. In course research, it found that plexus: involves 6 spine - L4 S2. These polysegmental, which indicates their compensatory properties. highest percentage gives 6th lumbar segment axial nerve. obtained expand knowledge principles segmentation anatomy, become reference point regional epidural anesthesia orthopedic operations on limbs, blockade increase patient comfort postoperative period, puncture, neurotherapy. polarization microscopy used clinically useful test biopsy assess state neurodegenerative changes, monitoring regenerative neuroprotective effects. Key words: Wallerian innervation, plexus, microscopy,