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Sexual differentiation in the terminal ganglion of the moth Manduca sexta : Role of sex‐specific neuronal death
Author(s) -
Giebultowicz Jadwiga M.,
Truman James W.
Publication year - 1984
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.902260107
Subject(s) - manduca sexta , biology , manduca , sexual differentiation , neuroscience , ganglion , microbiology and biotechnology , endocrinology , insect , ecology , genetics , gene
In the insect Manduca sexta the genitalia on the terminal abdominal segments are sexually dimorphic structures but they arise during metamorphosis from segments that are monomorphic in the larva. The motoneurons in the terminal ganglion that innervate these structures were examined by cobalt backfills of peripheral nerves. In the larval stage the population of motoneurons innervating the terminal segments was identical in both sexes. By contrast, the motoneuron populations in the terminal ganglia of adult males and females were strikingly different. No new motoneurons were produced during metamorphosis. Rather, this difference was the result of sex‐specific cell death which occurred primarily during the early stages of adult differentiation. Possible mechanisms underlying this sex‐specific degeneration of neurons are discussed.