Histogenesis study of the ovine lens

Subject Areas : Veterinary Clinical Pathology

M.A Ebrahimi ¹ , رضا Najjar ² , رعنا Keyhanmanesh ³

1 - Department of Basic Sciences, Faculty of Veterinary Medicine, Islamic Azad University- Tabriz Branch, Tabriz, Iran
2 - Graduat of Veterinary Medicine, Islamic Azad University-Tabriz Branch, Tabriz, Iran
3 - Department of Physiology, Faculty of Veterinary Medicine, University of Medical Sciences, Tabriz, Iran

Received: 2008-06-26 Accepted : 2010-01-04 Published : 2009-11-22

Keywords: Ovine, Histogenesis, Lens,

Abstract :

In this study, 78 sheep fetuses were used for the evaluation of anatomic and histologic aspects of lens with three methods (H&E, Verhoeff's and P.A.S. staining). The results showed that the lens vesicle was formed completely by 30th day and lost its contact with the superficial ectoderm. In 40th day of fetal period, the epithelium of the posterior wall of the lens gradually started to disappear due to its development and formation of forward facing elastic fibers limiting the internal space of the vesicle. By 150th day, the density and thickness of these fibers were increasing. In addition, at this day, the capsule of the posterior surface of the lens started to form. In 50th day of fetal period the internal space of vesicle was filled with elastic fibers and the epithelium of the anterior surface became simple cuboidal. At that day, the capsule of the anterior surface of the lens gradually was formed and in 60-day fetus, it became complete. By 150th day, its thickness was increased a little. After 80th day, the convexity of the posterior part would become more than the convexity of the anterior part because of the increased growth of lens fibers.

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