Abstract
The glial cells of the prothoracic ganglion of the hawk moth Manduca sexta were studied in histological sections of several postembryonic stages and classified according to cell morphology, size, staining properties, and topographical relationships. In general, each glial cell type was found to be confined to one of the major ganglionic domains and each of these domains (i.e., perineurium, cell body rind, glial cover of the neuropil, and neuropil) was found to comprise specific cell types. Some types of glia were recognized in both larval and later stages, but other types were found exclusively from late pupal stages. It is proposed that the higher morphological diversity expressed by the glia of the pharate adult is attained by differentiation of new cell types during metamorphosis. Before the differentiation of new cell types, extensive cell death and cell proliferation seem to occur within some glial subpopulations.
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