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Fig. 10. Schematic representation of mandibular organ-inhibiting hormone (MOIH)-like
immunoreactivity in the stomatogastric nervous system (STNS) of
Cancer species. In this diagram, filled circles represent
immunopositive somata, thick lines within nerves represent immunopositive
axons and tangles of thin lines represent regions of immunopositive neuropil
or neuroendocrine release sites. In addition to labeling the anterior cardiac
plexus (ACP) and the axons innervating it, MOIH-like labeling was also evident
in other regions of the STNS. In brief, approximately a dozen somata were
labeled in each commissural ganglion (CoG), as were two in the stomatogastric
ganglion (STG). No immunopositive somata were present in the esophageal
ganglion (OG) nor were any seen in the nerves of the STNS. Immunopositive
neuropil was present in the CoGs and the STG. Extraganglionic neuropil was
present in the superior esophageal nerves (sons; most commonly in the
vicinity of the dorsal posterior esophageal nerve (dpon)], at the
junction of the sons, the esophageal nerve (on) and the
stomatogastric nerve (stn), as well as in the stn proper
[commonly near the insertion point of the anterior cardiac nerves
(acns)]. The immunopositive neuropil in the STG probably originates
from both the arborizations of the intrinsic somata as well as from the
arborizations of approximately six axons projecting from the stn
(approximately three from each son). Immunopositive axons were also
present in the circumesophageal connectives (cocs), which link the
STNS to the supraesophageal and thoracic ganglia, as well as occasionally in
the anterior lateral nerves (alns; one axon in each aln)
that emanate from the STG and innervate muscles of the gastric mill region of
the foregut.
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