By M.P. Wiedeman (Auth.)

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Low power magnification of a single layer preparation of the pouch confirms the impression of a profuse and random distribution of arterial vessels with numerous diminutive branches or offshoots and a greater number of large venous vessels which seem to dominate the vascular bed (Fig. 34). At higher magnifications (22=450x), it is posible to determine the diameters of arterial vessels branching from the first order parent vessel down to those of the terminal arteriole (which is the fourth order of branching) and the capillary.

Small arteries have diameters of approximately 50 μπι and walls that are 2-3 μ,ηι thick. Arterioles, the next order of branches, are vessels with diameters of 20-40 μπι, with a single layer of smooth muscle. The final length of 200-300 μ,ηι of the arterioles is designated as terminal arteriole, and precapillary vessels are the lateral branches from the arterioles from which capillaries originate. The venous system begins where capillaries join to form the first of the confluent vessels. These venous vessels have diameters of 15-20 μτη and are called postcapillaries.

29). Bloch (1956) Fig. 3 . 2 9 . Superficial vascular patterns seen in human conjunctiva. ) V. Pia Mater 55 published a detailed descriptive paper on circulating blood in the conjunctiva in health and disease. He points out that arteriolar vessels should be easily identified by noting the direction of flow, which is always toward progressively smaller vessels until the capillaries are reached. He noticed frequent changes in the direction of flow, a characteristic also seen in other vascular beds such as mesen­ tery and omentum.

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