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Related Experiment Videos

Pineal complex of the clawed toad, Xenopus laevis Daud.: structure and function

H W Korf, R Liesner, H Meissl

    Cell and Tissue Research
    |January 1, 1981
    PubMed
    Summary

    The pineal complex of Xenopus laevis, including the frontal organ and epiphysis, is light-sensitive. It exhibits distinct achromatic and chromatic responses, revealing its role in vertebrate photoreception.

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    Area of Science:

    • Neurobiology
    • Comparative Anatomy
    • Sensory Physiology

    Background:

    • The pineal complex, comprising the frontal organ and epiphysis cerebri, is a key component of the vertebrate sensory system.
    • Understanding its structure and function in amphibians like Xenopus laevis provides insights into vertebrate photoreception evolution.

    Purpose of the Study:

    • To investigate the morphological and physiological characteristics of the Xenopus laevis pineal complex across different life stages.
    • To elucidate the neuronal organization, synaptic structures, and light sensitivity of the frontal organ and epiphysis.

    Main Methods:

    • Morphological analysis using acetylcholinesterase (AChE) staining to identify neurons and nerve fibers.
    • Microscopic examination of neuropil and synaptic structures, including ribbon synapses.

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  • Electrophysiological recordings from the frontal organ nerve and epiphysis in response to light stimuli.

    • Main Results:

    • Adult Xenopus laevis frontal organs are well-differentiated, containing photoreceptors and approximately 30 AChE-positive neurons.
    • The epiphysis cerebri possesses photoreceptor cells, ~100 AChE-positive neurons, and a pineal tract; its topography differs from ranid species.
    • Electrophysiology revealed direct light sensitivity in the pineal complex, with the frontal organ showing both achromatic and chromatic responses, while the epiphysis exhibited only achromatic responses.

    Conclusions:

    • The Xenopus laevis pineal complex is functionally active and directly responsive to light, with distinct regional specializations.
    • The frontal organ's chromatic response suggests a role in color vision or spectral sensitivity, while the achromatic response is common to both structures.
    • The findings contribute to understanding the diversity and functional significance of the pineal complex in amphibians.