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Journal of Experimental Biology 137,107-117 (1988)
Published by Company of Biologists 1988

Involvement of the Terminal Abdominal Ganglion in Neuroendocrine Regulation of Integumentary Water Loss in the Cockroach Periplaneta Americana L

John Noble-Nesbitt ¹ and Marwan Al-Shukur ²

¹ School of Biological Sciences, University of East Anglia, Norwich
² School of Biological Sciences, University of East Anglia, Norwich: Department of Biology, College of Education, University of Baghdad, Iraq.

Neuroendocrine secretions from the terminal abdominal ganglion (TAG) augment the cephalic neuroendocrine regulation of integumentary water loss in the cockroach. As with the cephalic system, the TAG produces both promoting (TAGP) and restricting (TAGR) secretions which, respectively, lead to an increase or a decrease in the rate of integumentary water loss. The promoting factor (TAGP) requires priming by the cephalic promoting factor (BHP) before it is activated, and it probably acts by stimulating release of more BHP which in turn increases water loss through the integument. The restricting factor (TAGR) is autoactive and exerts its effects even in the absence of the cephalic neuroendocrine system or its secretions. It provides additional, independent restriction of integumentary water loss in adverse (desiccating) ambient conditions. Its action accounts for the longer-term decrease in water loss found in decapitated cockroaches.

These effects parallel closely the effects of the diuretic and antidiuretic hormones produced by the TAG. Measurement of faecal product demonstrates that the changes in overall water loss are not primarily due to changes in excretory loss but are due to regulation of integumentary permeability.

Key words: Periplaneta, water loss, desiccation, neuroendocrine, decapitation, terminal abdominal ganglion.

Accepted on March 2, 1988

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