Abstract
A fully active corpus allatum contains neurosecretory granules transported into the gland by the nervus corporis allati 1. An inactive gland, from a newly emerged adult, contains ‘empty’ neurosecretory granules. An ultrastructural study of the corpora allata from adult male desert locusts of various ages has established a close correlation between cytological changes and the hormonal activity of the glands. An active gland has sparsely distributed chromatin masses, numerous aggregated smooth-surfaced vesicles of the endoplasmic reticulum, and mitochondria of complex structure. An inactive gland has clumped chromatin masses, few elements of the endoplasmic reticulum, and small mitochondria of simple structure. The greatest changes in the allatum cells (and in their hormonal activity) occur between the third and fifth days in the adult stage at 30±1°C.
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