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Figure 4: Transmission electron microscopy after 8 weeks of nerve injury: (a) CG—general view of the sciatic nerve fibers with myelin (M), groups of unmyelinated fibers (arrows), and Schwann cells with evident nucleus (N) (mag: ×3.000). (b) CG—detailed image of mitochondria in the axoplasm of a myelinated fiber (arrow) and in the cytoplasm of Schwann cells (arrowhead) (mag: ×20.000). (c) EG—myelinated fibers (M) and a grouping of unmyelinated fibers (arrows) (mag: ×3.000). (d) EG—detailed image of the neurofilaments of the axoplasm (*) and the lamellae of myelin (arrows) (mag: ×30.000). (e) IG—degenerated areas (**) among the intact myelin fibers (M) (mag: ×3.000). (f) IG—Details of an area of degeneration of nerve fibers in the presence of myelin debris (thin arrows) (mag: ×5.000). (g) LG—myelinated (arrows) and unmyelinated fibers (arrowheads) arranged in bundles (mag: ×2.500). (h) LG—degenerated area of nerve fibers (**) containing myelin debris (thin arrows)—(mag: ×6.000). (i) PG—grouping of myelinated (arrows) and unmyelinated (arrowheads) nerve fibers, and an area of degeneration (thin arrow) (mag: ×2.500). (j) PG—detailed image of groupings of unmyelinated fibers with mitochondria (arrowheads) in axoplasm (*) and collagen fibers of the endoneurium (C) (mag: ×20.000). (k) LPG—general view of bundles of myelinated fibers (arrows) and an area of degeneration (arrowheads) (mag: ×1.800). (l) LPG—detailed image of a bundle of nerve fibers reveals myelinated and (M) unmyelinated fibers (arrowheads) and Schwann cells (S) (mag: ×5.600).