Sexual differentiation in the terminal ganglion of the moth Manduca sexta: Role of sex‐specific neuronal death

@article{Giebultowicz1984SexualDI,
  title={Sexual differentiation in the terminal ganglion of the moth Manduca sexta: Role of sex‐specific neuronal death},
  author={Jadwiga Maria Giebultowicz and James W. Truman},
  journal={Journal of Comparative Neurology},
  year={1984},
  volume={226}
}
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… 
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Sex‐specific neuronal respecification during the metamorphosis of the genital segments of the tobacco hornworm moth Manduca sexta
TLDR
All of the adult skeletal muscles of the moth Manduca sexta are derived from preexisting larval skeletal muscle motoneurons, which are determined by the sex of the individual and independent of motor innervation at the start of metamorphosis.
Sexual differentiation in the CNS of the moth, Manduca sexta. I. Sex and segment-specificity in production, differentiation, and survival of the imaginal midline neurons.
TLDR
This analysis of the development of several sets of postembryonic sex-specific motoneurons in Manduca sexta suggests that both the sex of these cells and their segment of residence play major roles in their subsequent differentiation.
Sexually dimorphic neurons of the terminalia of Drosophila melanogaster: II. Sex-specific axonal arborizations in the central nervous system.
  • B. Taylor
  • Biology, Medicine
    Journal of neurogenetics
  • 1989
TLDR
This work has determined the projection pattern of sensory neurons that innervate the sex-specific adult terminalia, the genitalia and analia, of Drosophila melanogaster, which causes female flies to be transformed into phenotypic males.
Sexually dimorphic neurons in the terminalia of Drosophila melanogaster: I. Development of sensory neurons in the genital disc during metamorphosis.
  • B. Taylor
  • Biology, Medicine
    Journal of neurogenetics
  • 1989
TLDR
The data suggest that the sexually dimorphic arrangement of sensory neurons is a product of sex-specific neurogenesis in Drosophila melanogaster males and females.
Fate of abdominal ventral unpaired median cells during metamorphosis of the hawkmoth, Manduca sexta
TLDR
Spontaneous excitatory synaptic potentials occurred in the ventral median neurons of each ganglion in an anterior‐to‐posterior sequence and were eliminated when the interganglionic connective was interrupted posterior to the subesophageal ganglions.
Comparison of neural elements in sexually dimorphic segments of the grasshopper, Schistocerca americana
TLDR
This work compares three classes of identifiable adult neurons: ovipositor motor neurons, efferent dorsal unpaired median (DUM) neurons, and DUM interneurons in the eighth abdominal neuromere, and shows how the central nervous system of adults is organized to support the obvious behavioral dimorphism.
Postembryonic neurogenesis in the CNS of the tobacco hornworm, Manduca sexta. I. Neuroblast arrays and the fate of their progeny during metamorphosis
TLDR
The tobacco hornworm Manduca sexta exhibits dramatic changes in its body morphology and behavior as it is transformed from a larva into an adult during metamorphosis, which involves both the death and remodeling of subsets of larval neurons.
The fate of specific motoneurons and sensory neurons of the pregenital abdominal segments inTenebrio molitor (Insecta : Coleoptera) during metamorphosis
TLDR
Extensive changes occur in the number of muscles located in the ventral region of the pregenital abdominal segments, as well as in the arrangement and number of sensory neurons, in the structure of the exoskeleton, and even in the central nervous system of Tenebrio molitor.
Respecification of larval proleg motoneurons during metamorphosis of the tobacco hornworm, Manduca sexta: segmental dependence and hormonal regulation.
TLDR
The findings suggest that, unless an abdominal source of ecdysteroids exists in pupae, a relatively small exposure may be sufficient for motoneuron outgrowth, but the hormonal dependence of dendritic outgrowth was tested by isolating abdomens to eliminate the Ecdysteroid-secreting glands in the thorax.
Hormonal regulation and segmental specificity of motoneuron phenotype during metamorphosis of the tobacco hornworm, Manduca sexta.
TLDR
It is found that segmental location can influence both the metamorphic fate and the hormonal sensitivity of Manduca motoneurons and theoretical calculations of hemolymph hormone profiles produced by the infusions support a model of ecdysteroid action in which the hormone concentration must remain above a threshold level for a critical duration of time to be physiologically effective.
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