Abstract
AbstractA description is given of the neurosecretory system and a possible neuroendocrine system in polychaetes of the families Aphroditidae, Polynoidae and Sigalionidae. Two paired tracts and one unpaired tract of neurosecretory axons, and the ganglionic nuclei from which they arise, have been detected. The neurosecretory tracts are directed to the brain floor where they form a storage‐and‐release complex or neurosecretory neuropile, containing secretion‐laden fibre terminals which are diverse in character and can be distinguished on the basis of staining properties. Bundles of axons (transcapsular fibres) pass through the neurallamella and come into close association with the epithelioid cells of the infracerebral gland, a possible endocrine structure. The “gland” cells resemble monopolar neuron cell bodies in morphology and are of two types: a cells are devoid of secretory material, whereas b cells contain accumulations of PAF‐positive inclusions. Possible simple photoreceptors are associated with part of the cerebral neurosecretory system.
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