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A correlation of ultrastructure and function in the developing retina oof the frog tadpole

Nilsson, S E ; Crescitelli, F

Journal of ultrastructure research, January 1970, Vol.30(1), pp.87-102

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  • Título:
    A correlation of ultrastructure and function in the developing retina oof the frog tadpole
  • Autor: Nilsson, S E ; Crescitelli, F
  • Assuntos: Retina -- Growth & Development
  • É parte de: Journal of ultrastructure research, January 1970, Vol.30(1), pp.87-102
  • Descrição: The first electroretinographic response to light in developing tadpoles ( ) was a purely cornea-negative slow potential which corresponded in time of first appearance with the first appearance of retinal receptor outer segments as revealed by electron microscopy. At this stage (6–7 days after fertilization) the receptors possessed a minimal number of developing outer segment disks, which are known to house the visual pigment molecules. The inner segments, in turn, possessed all the structural components typical of the adult receptor cell. No signs were noted of receptor synaptic structures or of the outer plexiform layer. We interpret these findings as indicating that the visual receptors at this stage of development are able to generate a potential in response to a light flash, but are unable to propagate this excitation inward to the neuronal layers. The initial negative potential may be, therefore, an isolated receptor potential. The appearance of the positive potential somewhat later in development was correlated in time with the maturation of the receptor synaptic apparatus. The correlation in times of appearance of the positive potential and the mature synaptic apparatus confirms our earlier results with , a species characterized by a slower rate of development.
  • Idioma: Inglês

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