Morphology of extraganglionic fluorescent neurons in the myenteric plexus of the small intestine of the rat

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Abstract
Fluorescent histochemical observations on the small intestine of the rat demonstrated that single fluorescent cells, separate from the principal ganglia, were present in the myenteric plexus. These extraganglionic cells gave rise to single processes which entered the ganglia and the interganglionic strands. They were of a very small size and were generally unipolar or pseudounipolar. A few fluorescent cells were also observed scattered along the interganglionic strands. Interruption of extrinsic nerve pathways to the small intestine caused a disappearance of meshworks of fluorescent fibers in the myenteric plexus, but in some areas the fluorescent cell alone was seen to remain. A photograph taken from the denervated myenteric plexus revealed that the cell possessed a quite long process.