Surface ultrastructure of the cornea and adjacent epidermis during metamorphosis of Rana pipiens: a scanning electron microscopic study

Journal of Morphology
Jane C KaltenbachS Susan

Abstract

The external surface of the cornea and adjacent epidermis of larvae in representative developmental stages and of adult frogs, Rana pipiens, was studied by scanning electron microscopy. Surface cells are polygonal, usually hexagonal, in outline and covered with microprojections. During larval development prior to metamorphic stages, neither eyelids nor Harderian glands have developed; microprojections on the corneal surface are high and branched, and cell boundaries are elevated. On the anterior portion of the cornea and on the epidermis near the eye, the surface pattern is less dense, and ciliated cells are present. During metamorphic stages, corneal cell boundaries become less prominent and the pattern of microprojections more variable and markedly different from that of larvae of earlier stages. Corneal cells have a spongy appearance, are covered by a coating material, or are characterized as light or dark based on their brightness and surface texture. As eyelids develop in metamorphic stages XX-XXI, the numbers of ciliated cells increase dramatically, both on the corneal surface and on the edges of the developing lids. In later metamorphic stages XXII-XXV, lids and Harderian glands become well-developed, and cilia are no lo...Continue Reading

Citations

Mar 1, 1988·Cell and Tissue Research·K UeharaS Miyoshi
Jun 25, 2005·Micron : the International Research and Review Journal for Microscopy·L de Brito-Gitirana, R A Azevedo
Apr 4, 2000·Cornea·S P Collin, H B Collin
Sep 5, 2006·Micron : the International Research and Review Journal for Microscopy·F A FelsemburghL de Brito-Gitirana
Mar 2, 2017·Veterinary Ophthalmology·Sarah A CannizzoHans D Westermeyer

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