Illustration of nerve fibers depicted as tubes. From "Tractatus physico-medicus de homine," by T. Craanen. Published in 1689. A nerve fiber is a threadlike extension of a nerve cell and consists of an axon and myelin sheath (if present) in the nervous system.

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Keywords: 1600s, 1689, 17th, anatomy, art, bw, century, craanen, fiber, fibers, fibre, histology, history, illustration, micrograph, microscopic, nerve, nervous, science, system, tube, tubes, tubule