Abstract
The median neurosecretory cells and their pathways and the corpora cardiaca of adult and larval Schistocerca gregaria Forsk and adult Locusta migratoria L. were investigated histochemically by means of the fluorescence microscopic method for visualization of biogenic monoamines, and histologically by “neurosecretory staining”. No obvious differences between the two species were found. The larvae have less peptidergic and aminergic material than the adults. Perikarya of different types occur in the anterior pars intercerebralis: (1) several hundred green-fluorescent cell bodies, most of which probably contain dopamine; (2) one yellow-fluorescent cell body; (3) many hundred peptidergic cell bodies (A and B cells); and (4) several hundred cell bodies which are neither aminergic nor peptidergic. The monoamine containing cell bodies are not identical to the peptidergic ones. The Ncc1 contain peptidergic and aminergic fibres. The monoamine-containing fibres appear as typical varicose neurons, beaded fibres with droplet-like swellings, and fibres with droplets containing primary catecholamines and an indolylalkylamine. Besides the catecholamine and indolylalkylamine fluorophores a third type of formaldehyde-induced fluorophore is described and its nature discussed. The peptidergic and monoaminergic materials accumulate in the storage lobe of the corpus cardiacum, but as a rule the two types of substance do not correspond spatially. The great majority of glandular cells of the corpus cardiacum contain no peptidergic neurosecretory material or monoamines.
Published Version
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