Fine structure of the lateral cardiac nerves of the cockroach Periplaneta americana (L.) |
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| Authors: | B Johnson |
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| Affiliation: | 1. Department of Physiology and Biophysics, University of Washington, 1705 NE Pacific Street, Seattle, WA 98195, USA;2. Department of Neurobiology, Harvard Medical School, 220 Longwood Avenue, Boston, MA 02115, USA;1. Humboldt-University Berlin, Department of Biology, Behavioral Physiology, Invalidenstrasse 43, 10115 Berlin, Germany;2. Friedensallee 37, 14532 Stahnsdorf, Germany;3. Museum für Naturkunde, Invalidenstrasse 43, 10115 Berlin, Germany;4. University of Melbourne, School of Biosciences, Melbourne, VIC 3010, Australia |
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| Abstract: | A high proportion of the axons which comprise the lateral cardiac nerves of Periplaneta americana were found to contain neurosecretory granules. Granules of two size ranges were identified. Clusters of vesicles were found both in axons containing large granules and in axons containing small granules where the axons were adjacent to the stroma, suggesting release of at least two types of neurohormones into the blood. Synapses were also found between axons containing small granules and heart muscle cells, suggesting that the material contained in some granules functions as a neurotransmitter. These findings are discussed in relation to the regulation of the heart in the cockroach. |
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