Abstract
The ingluvial ganglion, which belongs to the stomatogastric nervous system, has been localized in the thorax of Blabera craniifer and examined both in light and in electron microscopy. The ganglion lies in the bifurcation zone of the oesophageal nerve and extends into the proximal parts of the ingluvial nerves. It is surrounded by the usual sheath, including a layer of glial cells provided with numerous microtubules. The major part of the ganglion is nervous in structure. Neuron somata are found exclusively on the dorsal, side. Neuropil occurs as small patches scattered throughout the medial part and becomes highly developed in the distal part and origin of the ingluvial nerves. In neuron somata and mainly in neuropil fibres occur numerous vesicles, some of which are neurosecretory and others resembling synaptic vesicles. As previously demonstrated, some neurons are aminergic. It seems likely that the ingluvial ganglion assumes both neurohemal and relay functions. 29071971.
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