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Journal of Experimental Biology 48,325-338 (1968)
Published by Company of Biologists 1968

The Location of Penetration Barriers in the Ganglia of the American Cockroach, Periplaneta Americana (L.)

M. E. ELDEFRAWI ¹, A. TOPPOZADA ², M. M. SALPETER ¹, and R. D. O'BRIEN ³

¹ Section of Neurobiology and Behavior, Cornell University, Ithaca, New York
² Section of Neurobiology and Behavior, Cornell University, Ithaca, New York; Faculty of Agriculture, University of Alexandria, Alexandria, Egypt, U.A.R.
³ Section of Neurobiology and Behavior, Cornell University, Ithaca, New York; N.I.H. Career Development Awardee K no. NB-3738

1. The nature and location of the barrier system which partially protects the nervous system in insects has been investigated in the American cockroach by studying the fluxes of ¹⁴C-butanol, ¹⁴C-butyrate, ¹⁴C-butylamine and ³H-butyltrimethylammonium.

2. Disruption of the sheath covering the ganglia has little effect on the influx of butanol and butyrate, but increased that of butylamine and butyltrimethylammonium.

3. 2,4-Dinitrophenol slowed the influx of only those compounds whose metabolism it blocks.

4. Effluxes show a fast and a slow component. Disruption of the sheath increases the amount but not the rate of the fast component; it raises the rate of the slow component for butanol, butyrate and butyltrimethylammonium, but not always.

5. Nerve cords stained with methylene blue and freeze-sectioned show dye concentrated in the fat tissue surrounding the nerve cord, then in the neural lamella; a little penetrated the cell bodies of glia and neurones, but the neuropile was unstained.

6. These findings suggest that the external sheath plays some part in restricting cation influx; apart from this the barrier system is a function of the whole ganglion, except that the neuropile may enjoy special protection.

Note:

This research project was supported in part by N.I.H. grant 07804-06 and 10422-04.

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