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. 2005 Jan 1:10:127-148.
doi: 10.1016/S1569-2590(05)10005-6.

Ciliary Body and Ciliary Epithelium

Nicholas A Delamere  1
Affiliations

Ciliary Body and Ciliary Epithelium

Nicholas A Delamere. Adv Organ Biol. .
No abstract available

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Figures

Figure 1
Figure 1. Topography of dog ciliary processes
Shown in this scanning electromicrograph, the ciliary processes resemble fins that are arranged radially at the root of the iris on its posterior surface. Ir = iris. Bar = 0.5mm. Taken from Morrison et al. Invest Opthalmol Vis Sci. 28, 1325–1340, 1987, J.B. Lippincott Company. Used with permission.
Figure 2
Figure 2
Figure 2a. Light photomicrograph showing the edge of a ciliary process from an albino rabbit. The bilayer of epithelial cells (indicated by an arrow) can be seen covering the blood capillaries within the ciliary process. Figure 2b. Scanning electromicrograph of arterioles (A) and veins (V) entering and exiting the goat ciliary process. These blood vessels serve the very elaborate capillary bed (C). Bar = 0.15mm. From Morrison et al. Invest Opthalmol Vis Sci. 28,1325–1340, 1987, J.B. Lippincott Company. Used with permission.
Figure 2
Figure 2
Figure 2a. Light photomicrograph showing the edge of a ciliary process from an albino rabbit. The bilayer of epithelial cells (indicated by an arrow) can be seen covering the blood capillaries within the ciliary process. Figure 2b. Scanning electromicrograph of arterioles (A) and veins (V) entering and exiting the goat ciliary process. These blood vessels serve the very elaborate capillary bed (C). Bar = 0.15mm. From Morrison et al. Invest Opthalmol Vis Sci. 28,1325–1340, 1987, J.B. Lippincott Company. Used with permission.
Figure 3
Figure 3. Diagram showing the location of cell-cell junctions in the ciliary epithelium
The pigmented ciliary epithelium is shown at the top with the nonpigmented ciliary epithelium beneath. Note that tight junctions are located in the nonpigmented ciliary epithelium cell layer, the layer which faces the posterior chamber of the eye. From Raviola, 1977, Exp. Eye Res., 25(Suppl), 25–63, Academic Press, Inc. Used with permission.
Figure 4
Figure 4. Distribution of Na,K-ATPase in the ciliary epithelium of the chick
The confocal microscopic image shows the result of an immunolocalization study carried out using an antibody directed against the beta-1 subunit of Na,K-ATPase. As judged by fluorescence intensity, Na,K-ATPase beta-1 polypeptide is abundant in the nonpigmented ciliary epithelium layer, particularly at the basal and lateral surfaces (the NPE layer points upward in this photograph). The Na,K-ATPase beta-1 signal is much more faint in the pigmented cell layer (downward-facing cells in this picture) where it is seen at the basal surface. Taken from an unpublished collaborative study by the author, Amy E. Moseley (University of Cincinnati, Cincinnati, OH), and Steven Bassnett (Washington University, St. Louis, MO).
Figure 5
Figure 5. A theoretical model depicting the principal ion transport mechanisms thought to underlie the secretion of aqueous humor by the ciliary epithelium
Nonpigmented cells (NPE) and pigmented cells (PE) communicate via gap junctions. Densely shaded areas between NPE cells represent tight junctions. The model shows sodium, potassium and chloride entering the PE via a Na/K/2Cl cotransporter and passing via gap junctions to the NPE. There, sodium is exported via Na,K-ATPase (the sodium pump). In the NPE, potassium imported by Na,K-ATPase is recycled out of the cell via potassium channels. Chloride exits the NPE via chloride channels. Taken from Coca-Prados et al. 1995, Am. J. Physiol. 268, C572–C579, The American Physiological Society. Used with permission.
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References

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