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FINE STRUCTURE OF THE OCTOPUS RETINA

FINE STRUCTURE OF THE OCTOPUS RETINA,TOSHIYUKI YAMAMOTO,KYOJI TASAKI,YOSHIO SUGAWARA,AKIRA TONOSAKI

FINE STRUCTURE OF THE OCTOPUS RETINA   (Citations: 29)
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The fine structure of the visual and the supporting cells and of the blood capillaries in the octopus retina is described. Lamellatcd structures contained in the proximal segment of the visual cell consist of compact arrays of dense membranes each of which is quintuple- layered and divides at its margins into two thinner sheets or membranes which are connected directly with the agranular or granular cndoplasmic reticulum. Proximal to the deeper extremitics of the rhabdomcres, the lateral plasma membranes of two adjoining visual cells contact each other forming a quintuple-layered compound membrane, which results in occlusion of the intercellular space. The central layer of the compound membrane is of high density, so that thc membrane, as a whole, appears to be a single thick layer at low magnifi- cations. The supporting cells are connccted with the neighboring visual cells by two typcs of junctions. Long slender processes extend from the supporting cells to the surface of the retina through narrow spaccs among the distal segments of the visual cells. The capillary cndothclial cclls are charactcrized by luminal surfaces irregularly contoured and by lateral surfaccs clahorately interdigitatcd. The functional significancc of the close contact between adjoining visual cclls is discussed.
Published in 2009.
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