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Figure 2


Fig. 2. The choroid rete mirabile in the eye of the rainbow trout. (A) Schematic drawing to illustrate the orientation of the vascular corrosion cast from which photomicrographs were taken. (B) View of vascular corrosion cast of left eye from inside the orbit. The opening in the lower centre presents the entry point of the optic nerve. (C) Area indicated by the broken rectangle in B at higher magnification, showing parallel array of intermingled arteries and veins in the choroid rete mirabile. (D) Dorsal view (anterior side is at the bottom) showing the connection between choroid rete mirabile and the dense network of choriocapillaries, which underlies the retina. Abbreviations: a, v, branches of the ophthalmic artery and vein, respectively; crm, choroid rete mirabile; cc, choriocapillaries. Scale bars, 2 mm in B and D, and 500 µm in C. (E) Simplified diagram of the mechanism for specific O2 secretion in the eye and swimbladder of fishes. The three essential components are indicated. See text for further explanation. A–D modified from Berenbrink (Berenbrink, 1995).





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