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  • Title: [Study of development of ciliary folds and Zinn's zonules in Rana temporaria L. by means of scanning electron microscopy].
    Author: Dabarian NV, Sleptsova LA, Ganieva LKh.
    Journal: Ontogenez; 1976; 7(2):200-3. PubMed ID: 1088373.
    Abstract:
    The development of ciliary folds and zonul of Zinn has been studied in the eyes of the common frog Rana temporaria L. by means of scanning electron microscopy. The development of ciliary folds begins at the stage 45 by the flexure of the external layer in the ciliary zone. At the stage 46 this process involves the internal layer and the folds become two-layered. The zonules of Zinn form before the folds of internal layer of the ciliary epithelium begin to form as separate bundles of fibers. At the stage 45 they are already distinct. Later the ciliary filaments fold in 2 felt-like layers -- zonula which pass from the equatorial lens zone and attach near orbiculum ciliaris. In the place of attachment the margin of zonul repeats the relief of folds, thus attaching to their whole surface, and individual filaments go farther, to orbiculum ciliaris. All these processes take place in they eye prior to the beginning of metamorphosis.
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