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Journal of Neuroscience, Vol 3, 585-602, Copyright © 1983 by Society for Neuroscience
Mapping of serotonin-like immunoreactivity in the lobster nervous system
BS Beltz and EA Kravitz
Serotonin exerts a wide range of physiological actions on many different
lobster tissues. To begin the examination of the role of serotonin in
lobsters at a cellular level, we have used immunohistochemical methods to
search for presumptive serotonergic neurons, their central and peripheral
projections, and their terminal fields of arborization. Whole mount
preparations of the ventral nerve cord and various peripheral nerve
structures have been used for these studies. With these tissues, more than
100 cell bodies have been found that show serotonin-like immunoreactivity.
Although a few of the cell bodies are located peripherally (near the
pericardial organs, a well known crustacean neurohemal organ), the vast
majority are located in central ganglia. Every ganglion in the ventral
nerve cord contains at least one immunoreactive cell body. The projections
of many of the neurons have been traced, and we have constructed a map of
the system of serotonin-immunoreactive cell bodies, fibers, and nerve
endings. In addition, a dense plexus of nerve endings showing
serotonin-like immunoreactivity surrounds each of the thoracic second roots
in the vicinity of groups of peripheral neurosecretory neurons. These
peripheral nerve plexuses originate from central neurons of the ventral
nerve cord. In some cases we have been able to trace processes from
particular central cell bodies directly to the peripheral nerve root
plexuses; in other cases we have traced ganglionic neuropil regions to
these peripheral endings.
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