EVOLUTION OF THE NEUROMUSCULAR MECHANISM 



833 



Fig. 206. Part of an anterior cornual cell from the calf's spinal cord, stained to show neurofibrils. 

 ax, axon; a, b, c, dendrites. (From Bethe.) 



Fig. 207. Schema of simple reflex arc; r, receptor in an epithelial membrane; a, afferent fiber; s, 

 synapses; c, nerve cell of motor neuron; c, efferent fiber; tn, effector organ. 



