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THE MORPHOLOGY OF THE SHEEP RETINA
Author(s) -
NILSSON SVEN ERIK G.,
KNAVE BENGT G.,
PERSSON HANS E.,
LUNT TÖNIS
Publication year - 1973
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1973.tb06039.x
Subject(s) - retina , ultrastructure , retinal pigment epithelium , biology , fundus (uterus) , microbiology and biotechnology , retinal , lipid metabolism , phagosome , anatomy , external limiting membrane , phagocytosis , neuroscience , ophthalmology , biochemistry , medicine
The present investigation was undertaken in order to provide a necessary ultrastructural basis for the complete interpretation of recent findings on the electrophysiology of the sheep retina and on the influence on retinal function of certain drugs and toxic substances. The sheep retina was shown to be a mixed retina with a rather large number of cones. The receptor cells were conventional in shape. Typical differences in light and electron optical density between rod and cone ellipsoids could be explained as differences in stainability of the mitochondrial content. Specific connections between the outer segment disks and the plasma membrane as well as the occurrence of phagosomes in the pigment epithelial cells are discussed in relation to the development and the renewal of the receptor outer segment. No melanin granules were seen in the pigment epithelium of the investigated specimens, which were all taken from the tapetal area of the fundus. The possible relation between lipid‐like bodies in the pigment epithelium and vitamin A metabolism is discussed.