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Journal of Neuroscience, Vol 5, 2424-2431, Copyright © 1985 by Society for Neuroscience
Dendritic reorganization of abdominal motoneurons during metamorphosis of the moth, Manduca sexta
RB Levine and JW Truman
During metamorphosis in the hawkmoth Manduca sexta, muscles of the
abdominal body wall undergo a reorganization. Many die at the end of larval
life and are replaced in the adult by newly generated muscles. We have
identified several of the motoneurons innervating these muscles and
followed them through metamorphosis. The morphology of larval motoneurons
is correlated with their target location. Those with medial targets have
bilateral dendritic fields, whereas those with lateral targets have
dendrites restricted to one side of the segmental ganglion. Some
motoneurons innervate the same muscle in all stages of life, but the
majority lose their larval targets following entry into the pupal stage.
Although some of the latter group also die at this time, most survive to
innervate a new adult target. These "respecified" motoneurons undergo a
period of dramatic dendritic growth during metamorphosis. The results
demonstrate that these identified neurons are capable, under the
appropriate conditions of existing in more than one stable morphology.
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