Abstract
The breakdown of the intersegmental muscles of the silkmoth abdomen is potentiated by exposure to ecdysone during the first few days of adult development. Three weeks later, after the completion of adult development, the actual breakdown is triggered by a neural mechanism. The latter consists of a sudden curtailing or cessation of the outflow of impulses in the motor nerves which innervate the abdominal muscles. The muscles attain the capacity to respond to this signal during the final 3 days prior to the moth's ecdysis. By chronic electrical stimulation of the nerves, the breakdown of the muscles can be opposed or prevented.
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