Abstract
Changes in fine structure of the corpora allata cells were observed through the larval and pupal stages of the silkworm. Basal lamina surrounding the corpora allata cells began to disappear at the beginning of the pupal stage. During this time, the axons in the cytoplasm and the basal lamina were found to reduce in number. Mitochondria changed from a spherical shape into a rod one during the larval-pupal development. Lipid droplets appeared and increased after the 8th day of the 5th instar larvae. Consideration was given to the relationship between these changes and the activity of corpus allatum.
