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Anatomy of neurons crossing the tritocerebral commissures of the cockroach Periplaneta americana (Blattaria)
Author(s) -
Gundel Matthias,
Penzlin Heinz
Publication year - 1995
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1052230210
Subject(s) - commissure , suboesophageal ganglion , biology , periplaneta , anatomy , ganglion , neuroscience , ventral nerve cord , posterior commissure , proctolin , axon , stomatogastric ganglion , anterior commissure , nervous system , cockroach , neuron , neuropeptide , central pattern generator , medicine , rhythm , ecology , biochemistry , receptor , nucleus
The neuronal connections of the tritocerebral commissures of Periplaneta americana were studied in the brain‐suboesophageal ganglion complex and the stomatogastric nervous system by means of heavy metal iontophoresis through cut nerve ends followed by silver intensification. The tritocerebral commissure 1 (Tc1) contains mainly the processes of the subpharyngeal nerve (Spn) whose neurons are located in both tritocerebral lobes and in the frontal ganglion. Some neurons of the frontal ganglion project through the Tc1 to the contralateral tritocerebrum. A few fibers in this commissure were observed projecting to the protocerebrum and the suboesophageal ganglion. There are tritocerebral neurons which pass through the Tc1 or the tritocerebral commissure 2 (Tc2) and extend on into the stomatogastric nervous system. One axon of a descending gaint neuron appears in the Tc2. This neuron lies in the tritocerebrum and connects the brain to the contralateral side of the ventral nerve cord. In addition, sensory fibers of the labral nerve (Ln) traverse both commissures to the opposite tritocerebrum. The anatomical and physiological relevance of the identified neuronal pathways is discussed. © 1995 Wiley‐Liss, Inc.