Classification of neurosecretory cells, neurons, and neuroglia in the cerebral ganglia of Haliotis asinina linnaeus by light microscopy

Abstract

The gross anatomical study of the nervous system of Haliotis asinina reveals that it comprises a pair of cerebral ganglia, a buccal ganglion, a pleuropedal ganglion mass, and a visceral ganglion, connected together by nerve commissures and connectives. There are eight types of nerve cells in the cerebral ganglia on the basis of their histological characteristics and stain affinity: two types of neurosecretory cells, three types of neurons, and three types of neuroglia. The neurosecretory cells are large and occur along the periphery of the ganglia. They contain neurosecretory granules in the cytoplasm that stained deep violet with paraldehyde-fuchsin. The neurons are the most numerous cell type and occur in various parts of the cortex. The neuroglia are small cells and contain spindle-shaped nuclei.