Vision and the skin camouflage reactions of Ambystoma larvae: the effects of eye transplants and brain lesions

@article{Pietsch1985VisionAT,
  title={Vision and the skin camouflage reactions of Ambystoma larvae: the effects of eye transplants and brain lesions},
  author={P. Pietsch and C. W. Schneider},
  journal={Brain Research},
  year={1985},
  volume={340},
  pages={37-60}
}
Salamander larvae typically adapt their dermal melanophores to achieve camouflage, and it has been known for some time that removal of the eyes abolishes the response. Here we survey the contribution of the optic system to the bright and dark camouflage reactions and report that: the stimulus depends on an interaction between the direct and reflected light; an eye mounted atop the head and oriented vertically tended not to support camouflage, even though the animal responded to visual cues and… Expand
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References

SHOWING 1-10 OF 27 REFERENCES
Retinal Projections in the Tiger Salamander, Ambystoma tigrinum; pp. 401424
TLDR
Degenerating retinofugal fibers and their terminal fields have been examined in the tiger salamander, Ambystoma tigrinum and the relationship of the appearance of the stained particles to the postsurgical survival time is described. Expand
Restoration of vision in genetically eyeless axolotls (Ambystoma mexicanum)
Abstract Eyes grafted into genetically eyeless axolotls at embryonic stages 26 or 27 (early tailbud stage) are capable of establishing retinotectal connections and restoring near normal vision.Expand
Retinofugal pathways in normal and albino axolotls
TLDR
It appears that the abnormality of the chiasmatic pathway, which has been found in albinos of many different mammalian species, does not occur in axolotls, as traced by tracing the transport of radioactive materials after tritiated proline was injected into one eye. Expand
The effects of addition and subtraction of eyes on learning in salamander larvae (Amblystoma punctatum).
TLDR
The results obtained from animals possessing only a supernumerary eye suggested that constraints were imposed centrally on the supern numerary eye of a three-eyed animal. Expand
Regions of the brain influencing the projection of developing optic tracts in the salamander
  • W. Harris
  • Biology, Medicine
  • The Journal of comparative neurology
  • 1980
TLDR
Eye primordia from the Mexican axolotl or the California newt were transplanted into hosts of either species and it was found that the optic fibers that reached the visual centers of the midbrain were organized retinotopically in the optic tectum and mediated visually‐guided behavior. Expand
Differences between embryos and adults in the plasticity of somatosensory afferents to the axolotl tectum.
TLDR
Results from the tectal excision experiments showed that retinal axons in adults regrew to innervate the ipsilateral tectum when deprived of their normal targets, and there was little difference in the distribution of somatosensory responses or serotonergic terminals; both remained relatively superficial and appeared to be unaffected by the late ingrowing retinalAxons. Expand
Prospective forebrain-midbrain from axolotl neurulae can be reprogrammed to differentiate as Mauthner cell-containing medulla.
  • P. Model
  • Biology, Medicine
  • Brain research
  • 1982
TLDR
The competence of prospective forebrain-midbrain taken from early midneurulae to produce medullae as well as M-cells indicates that specification of spatial pattern in the developing CNS has not yet occurred and that very precise regulating factors from the surrounding host tissues can override the original fate of the graft to bring it into accord with the system as a whole. Expand
Development of pigmentation in the eyeless mutant of the Mexican axolotl, Ambystoma mexicanum, Shaw.
  • L. Epp
  • Biology, Medicine
  • The Journal of experimental zoology
  • 1972
TLDR
Enhanced pigmentation in the eyeless mutant is postulated as due to abnormally high secretion of MSH by the pituitary causing normal pigment-producing systems to operate beyond normal limitations. Expand
The Pigmentary Effector System. VI. The Dual Character of Endocrine Co-Ordination in Amphibian Colour Change
TLDR
It is now clearly established that the pituitary gland is an essential agency in determining Amphibian colour change, and it is still possible to entertain the hypothesis that the gland is merely a condition of the response of the melanophores to nervous impulse in efferent fibres supplying the skin. Expand
PINEAL REGULATION OF BODY BLANCHING IN AMPHIBIAN LARVAE.
TLDR
This chapter discusses the body-blanching reaction of larval amphibians, presents all the data that led to the formulation of the pineal hypothesis, and clarifies some of the unsolved problems pertaining to this hypothesis. Expand
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