The presence of myotropic neurohormones was revealed some 40 years ago by Koller (1948), who showed that head and brain extracts of different species induced the acceleration of contractions of the Malpighian tubules, oviducts, and gut (Fig. 67). Subsequent investigations dealing with the main visceral organs, and almost always carried out in vitro or on semiisolated organs, led to the same conclusion. Most of them dealt with the heartbeat of the cockroach Periplaneta. The active factors were discovered in the CC and the central nervous system, and in the effectors themselves.
KeywordsDopamine Carboxyl Trypsin Norepinephrine Epinephrine
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