Topographic organization of the ganglion cell layer and intraocular vascularization in the retinae of two reef teleosts

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    Abstract

    The retinae of two species of teleosts, the rippled blennyIstiblennius edentulus and the blue tusk fishChoerodon albigena are examined in wholemount. The retinal topography of Nissl-stained cells within the ganglion cell layer in each species reveals a temporal (4.32 × 104 cells per mm2) and a nasal (3.83 × 104 cells per mm2) area centralis in the rippled blenny and two temporal areae centrales (8.30 × 104 and 8.00 × 104 cells per mm2) and a horizontal streak (5.00 × 104 cells per mm2) in the tusk fish. These areas are thought to subserve higher spatial resolution. Transcardial perfusions of indian ink reveal an extensive network of vitreal blood vessels which are supplied by the hyaloid artery and overlie the retina in each species. This rich network of vitreal vessels supplies areas of increased ganglion cell density although areas of maximum cell density are devoid of vessels to preserve the high spatial resolving power of the eye within this region. Unique blood vessel plexuses overlying the optic disc and falciform process in the tusk fish are also described. The diameter of the overlying vitreal vessels is compared to the soma sizes of cells within the ganglion cell layer.
    Original languageEnglish
    Pages (from-to)765-775
    Number of pages10
    JournalVision Research
    DOIs
    Publication statusPublished - 1989

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