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The structure of the terminal ganglionic mass of the locust, Schistocera gregaria (forskäl)
Author(s) -
Seabrook W. D.
Publication year - 1970
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.901380106
Subject(s) - ganglion , commissure , anatomy , biology , locust , terminal (telecommunication) , neuroscience , botany , telecommunications , computer science
Sections of the terminal ganglionic mass reveal a neuropile comprising four fused units corresponding to the eighth, ninth, tenth, and eleventh abdominal ganglia. Segmentally arranged groups of interneurons further illustrated the segmental nature of this ganglionic mass. Condensation of the component ganglia has resulted in a reduction in the number of commissures, the eighth ganglion retaining five of the original eight found in a simple ganglion, and each subsequent ganglion retaining four. There is a reduction in the number of discrete neuron groups and in the number of lateral interneurons coincident with the degree of condensation. Associated with the degree of condensation is a relocation of the motor neurons from the lateral ventral regions of the ganglion to the dorsal surface. One‐hundred‐five neurons have been traced within the terminal ganglionic mass.