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… 
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.
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 17 REFERENCES
Metamorphosis of the insect nervous system: changes in morphology and synaptic interactions of identified neurones
TLDR
It is shown that in the tobacco hornworm, Manduca sexta, the adult function of a neurone is prevented from being expressed precociously by the persistence of inhibitory influences that are removed abruptly at adult emergence.
Trans-sexually grafted antennae influence development of sexually dimorphic neurones in moth brain
TLDR
Surgical procedure for producing antennal gynandromorphs of Manduca is devised in which one of the two ALs receives sensory innervation from an antenna formed by a transplanted imaginal disk of the opposite sex, and the physiological and morphological properties of certain AL neurones are influenced by the gender of the antenNal sensory axons contacting them.
Programmed cell death in the nervous system of an adult insect
  • J. Truman
  • Biology, Medicine
    The Journal of comparative neurology
  • 1983
TLDR
Analysis of the death of identified motorneurons showed that there was a precise spatial and temporal program of neuronal death in the tobacco hornworm moth, which was somewhat flexible in that the fates of certain cells could be adaptively modified by behaviors that might naturally occur in the life of the insect.
Post-embryonic cell lineages of the nematode, Caenorhabditis elegans.
TLDR
These cell lineages range in length from one to eight sequential divisions and lead to significant developmental changes in the neuronal, muscular, hypodermal, and digestive systems and are determined by direct observation of the divisions, migrations, and deaths of individual cells in living nematodes.
Olfactory interneurons in the moth Manduca sexta: response characteristics and morphology of central neurons in the antennal lobes
TLDR
Two types of pheromone-sensitive local interneurons have been described morphologically and physiologically while a single type of output neuron has been found that has a dendritic arborization in the macroglomerular complex.
Dendritic reorganization of an identified motoneuron during metamorphosis of the tobacco hornworm moth
In the tobacco hornworm, many larval motoneurons become respecified and supply new muscles in the adult. Changes in the morphology of one such neuron were examined through metamorphosis. The
Hormone accumulation in a sexually dimorphic motor nucleus of the rat spinal cord.
TLDR
A morphological sex difference in hormone-sensitive motoneurons that are probably involved in the sexually dimorphic copulatory behavior of the rat are demonstrated.
Male and female visual neurones in dipterous insects
TLDR
Results are reported from another species (the blowfly, Calliphora erythrocephala) demonstrating another kind of sexual difference of neural architecture in the visual system, expressed by differences in the shapes of analogous neurones in males and females, as well as by the presence of some cells in only one sex.
Sex differences in dendritic structure in the preoptic area of the juvenile macaque monkey brain.
TLDR
Quantitative analysis of Golgi-stained neurons in the preoptic area of the brain of prepuberal Macaca fascicularis monkeys indicated structural differences between males and females, suggesting that sexual dimorphism in the function of the monkey pre optic area may be based on differences in neuronal structure.
Programmed death in the nervous system of a moth
TLDR
Ability to manipulate the fate of identified cells may eventually lead to insights into the cellular mechanisms that bring about neuronal death in the tobacco hornworm moth.
...
1
2
...