The use of histochemical methods shows that the main splenic artery has both a cholinergic and noradrenergic nerve supply, but only noradrenergic nerve fibres are found in the spleen. The innervation of the smooth muscle of the spleen is sparse. Electron-microscopy reveals the presence of large and small granular vesicles in terminal fibres, but only large granular vesicles in non-terminal axons. The way in which the innervation pattern may determine the characteristics of neurotransmission in the spleen is discussed.
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A. J. Filery-Travis (1970) studied this question.
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