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ROSS GRANVILLE HARRISON 
Fig. 1 Diagram illustrating the mode of development of the sensory nerve 
plexus, derived from the dorsal cells of Rohon-Beard. Each segmental nerve is 
represented in its simplest terms as a single fiber originating in a single cell of the 
neural tube. A, early stage in which the nerve fiber has just begun to grow out. 
B, Later stage in which each segmental nerve has begun to branch. C, Final 
stage in which neighboring nerves form anastomoses with each other. 
