A simple nerve cell, or neuron. N is the nucleus of the cell, NC is the cytoplasm, D are dendrites which are fine protoplasmic branches that create synapses that connect to another nerve cell. The neuron is connected to muscle (MU) by a nerve fiber (NF). The fiber is covered by a sheath (SH) of fat to protect it. NE is the ending of the fiber that the muscle is connected to. LB is a lateral branch of the nerve fiber.
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Thomson, J. Arthur The Outline of Science volume II (New York, NY: G.P. Putnam's Sons, 1922)