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17
Types of Nerve Fibers in Peripheral Nerves
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Slide 17: TEM xs of a small unmyelinated nerve. The nerve fibers are enveloped in the cytoplasm (here colored yellow - no we can't take color EM's yet but Dr. Robbins' trusty highlighter did the job) of a Schwann cell (whose nucleus is not in this section). Note the external lamina and endoneurial collagen fibers as well as a fibroblast process. Within the nerve cell processes are abundant microtubules, some mitochondria. Several of the processes also contain transmitter vesicles.