PMID: 19942810Nov 28, 2009Paper

Relationship between distribution of tapetum fibrosum and retinal pigment epithelium in the sheep eye

The Journal of Veterinary Medical Science
Aya ShinozakiMasato Uehara

Abstract

The tapetum lucidum is a light-reflective device improving visual sensitivity in mesopic vision. There have been few studies on tapetal distribution and its relationship with degree of pigmentation in the retinal pigment epithelium (RPE). In the present study, sheep's eyes were used for macroscopical observation of the tapetum, and then histological sections of the posterior eyecups were made to analyze the distribution of tapetal thickness and degree of pigmentation in the RPE. Macroscopically, with available light, the tapetum was located in the dorsal eye fundus to the optic disc and showed an L-shape with the horizontally elongated nasal part and the dorsally expanded temporal part. In photographs with a flash, the tapetal area expanded and showed a more triangular shape. The tapetum histologically consisted of layers of dense collagen fibers and was thicker in the temporal part than in the nasal part. The maximum tapetal thickness was approximately 70 microm. The histological tapetal area was similar to the tapetal shape with a flash light. The pigmentation of the RPE was divided into three types, nonpigmented, transitional, and pigmented areas. The nonpigmented area was similar to the tapetal shape with available light. I...Continue Reading

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Citations

Oct 10, 2013·Journal of Anatomy·Aya ShinozakiMasato Uehara
Mar 3, 2015·The Journal of Veterinary Medical Science·Yasuhiro YamaueMasato Uehara
May 4, 2018·International Ophthalmology·Ahmed M KotbAhmed E Zayed

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