Abstract
Allatectomy reduces the synthetic activity of the cerebral neurosecretory system of Locusta migratoria migratorioides. Since the median neurosecretory cells are thought to produce an allatotrophic factor it is possible that a close interrelationship exists between the two endocrine centres. This possibility was investigated further by inactivating the cerebral neurosecretory system by allatectomy or starvation and subsequently implanting supernumerary active corpora allata. After corpus allatum implantation into allatectomized L. migratoria females a significant stimulation of neurosecretory synthesis, transport, and release occurs. Starved female locusts implanted with active corpora allata show elevated rates of synthesis and transport of neurosecretion. It is concluded that a positive feedback of corpus allatum hormone on the median neurosecretory A-cells occurs. It is suggested that such a feedback system facilitates the continuous production of batches of eggs under favorable conditions. Such a relationship may affect the interpretation of the results of endocrine surgery.
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