Studies on the Eyes of Fishes: Structure and Ultrastructure

  • J. A. C. Nicol
Part of the NATO Advanced Study Institutes Series book series (NSSA, volume 1)


The outer part of the retina is bounded by the pigment epithelium derived from the outer wall of the optic cup. The epithelium is usually pigmented, containing melanin. Its basal membrane forms the innermost lamella of the glassy or Bruch’s membrane, which also contains a thicker, loose fibrous layer, and an outer thin lamella which is the basal lamina of the choriocapillaris. There is usually an intricate meshwork of narrow spaces between the plasmalemma and the glassy membrane, spaces which are formed by foldings of the basal plasmalemma and which extend as clefts between the bases of adjacent cells as far as the desmosomes or tight junctions. The extent to which the basal plasmalemma is infolded varies greatly; it is, for example, greatly folded in stingrays. Walls of the endothelial cells of the choriocapillaris facing the pigment epithelium are pierced by capillary pores (fenestrated endothelial cells) (Arnott et al., 1972).


Pigment Epithelium Outer Segment Visual Pigment Lemon Shark Pigment Migration 


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© Plenum Press, New York 1975

Authors and Affiliations

  • J. A. C. Nicol
    • 1
  1. 1.Marine Science InstituteUniversity of TexasPort AransasUSA

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