Abstract
Summary The postembryonic development of three (neuro) endocrine centres in the snail Lymnaea stagnalis has been studied: (l) the endocrine Dorsal Bodies (DB), which are involved in the stimulation of vitellogenesis, and of growth, differentiation and secretory activity of the female accessory sex glands, (2) the Caudodorsal Cells (CDC), which control egg laying and egg-laying behaviour, and (3) the Light Green Cells (LGC), which stimulate body growth. Light microscopy, including immunocytochemistry with monoclonal antibodies, and electron microscopy show that the DB and LGC are already present in snails of 1 mm shell height, whereas CDC first appear in snails of 3 mm shell height. In such juvenile snails all cell types have a small size and occur in low numbers, but they show clear, morphological signs of formation of secretory granules. During development the cells strongly increase in size and, especially the DB cells, in number. The diameter of the secretory granules also increases, particularly in CD...
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