コワモンゴキブリの腹部神経節運動ニューロンの体節間相同性

概要

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Motoneurons innervating muscles of the third and sixth segment of the cockroach abdomen were stained by axonal infusion of cobalt ion. Considering the anatomical evidence already known, the results suggest that motoneurons of the five ganglia from the third to the seventh segment are serially homologous. Most of the motoneuron somata are located in the ventral cortical zone of the ganglion investigated and their dendrites all lie in the dorsal neuropile region. In most of the motoneurons innervating the ventral and dorsal longitudinal muscles, and the dorsal oblique muscle, their axons travel caudally through the connective and go out to the lateral nerve via the next posterior ganglion. On the other hand, all of the motoneurons innervating the vertical tergo-sternal muscle, the ventral oblique muscle and the other small muscles are located in the ganglion from which the nerves emerge. Comparing crafish abdominal motoneurons (Mittenthal and Wine, 1978), it is suggested that motoneurons innervating the ventral longitudinal muscles of the cockroach abdomen are homologous with the flexer motoneurons of the crayfish abdomen, and that in the cockroach abdomen, the second and third roots are fused with the first root of the next posterior ganglion.
社団法人日本動物学会の論文
1980-06-25