Neuronal connections between central and enteric nervous system in the locust, Locusta migratoria |
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Authors: | Peter Bräunig |
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Institution: | Entwicklungsbiologie und Morphologie der Tiere, Institut Biology II (Zoologie), RWTH Aachen, Kopernikusstrasse 16, 52074, Aachen, Germany. braeunig@bio2.rwth-aachen.de |
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Abstract: | The number and location of neurons, in the central nervous system, that project into the frontal connective was studied in
the locust by using retrograde neurobiotin staining. Staining one frontal connective revealed some 70 neurons in the brain.
Most of these were located within both tritocerebral lobes. Additional groups of neurons were located within the deutocerebrum
and protocerebrum. Some 60 neurons were labelled in the suboesophageal ganglion. These formed nine discernable populations.
In addition, two neurons were located in the prothoracic ganglion and two neurons in the first abdominal neuromere of the
metathoracic ganglion. Thus, some 250 neurons located within the head ganglia, and even neurons in thoracic ganglia, project
into the ganglia of the enteric nervous system. This indicates that the coordination between the central and enteric ganglia
is much more complex than previously thought. With the exception of some previously described dorsal unpaired median neurons
and a few motor neurons in the head ganglia, the identity and function of most of these neurons is as yet unknown. Possible
functions of the neurons in the thoracic ganglia are discussed. |
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Keywords: | Neurobiotin Frontal ganglion Ventral nerve cord Brain Locust Locusta migratoria (Insecta) |
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