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Journal of Experimental Biology 161,217-237 (1991)
Published by Company of Biologists 1991

Architecture of Cerebral Neurosecretory Cell Systems in the Silkworm Bombyx Mori

TOSHIO ICHIKAWA ¹

¹ Department of Biology, Faculty of Science, Kyushu University 33, Fukuoka 812, Japan

Anatomical and physiological characteristics of putative neurosecretory cells (NSCs) in the medial and lateral areas of the larval brain of Bombyx mori, identifiable by the opalescent appearance of their somata, were examined by means of intracellular recording and staining. Intracellular injection of Lucifer Yellow revealed that the medial cell group consisted of at least six subgroups of cells distinguishable by the geometry of their dendritic branches. Five subgroups of cells project axons to the contralateral corpus allatum (CA) or to the corpus cardiacum (CC). The remaining subgroup sends an axon to the ipsilateral ventral nerve cord. Three subgroups of cells were identified in the lateral group, projecting axons to the ipsilateral CC, to the CA or to the contralateral CA. Large and prolonged action potentials, similar to those recorded in some neurosecretory systems, were recorded from these medial and lateral cells. However, two pairs of medial cells containing paraldehyde-fuchsin-positive (neurosecretory) material and with axons extending to the contralateral nerve cord had action potentials of a short duration, more typical of non-NSCs such as tritocerebral cells innervating the stomodeal dilator muscles via the CC.

Key words: insect, neurosecretory cell, dye injection, action potential, Bombyx mori

Accepted on July 3, 1991

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