Abstract
The histochemistry of the neurosecretory material of the PF-positive and PF-negative neurosecretory cells of C. diaphanus has been investigated. The PF-positive neurosecretory material is proteinaceous with a high content of cystine, little or no tryptophan and little tyrosine and with weakly-reactive carbohydrate and lipid moieties. The PF-negative neurosecretory material (Light Green-positive) is proteinaceous, containing little or no cystine and tyrosine but a high content of trypophan. The secretion of the Light Green-positive cells appears to contain considerable quantities of 5-hydroxytryptamine or related amines. A small diastase-resistant, PAS-positive moiety may be present. The optic neurohaemal organ appears to store and release both types of neurosecretory materials. The PF-positive cells are characterized by a high glycogen content and the neurosecretory cells in general contain considerable quantities of cytoplasmic nucleic acids. A change in the histochemical nature of the neurosecretory material during the process of axonic transport from the brain to the optic neurohaemal organ is indicated.
Published Version
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