Text-book of ophthalmology . HE UVEA 375 (c) Chorioid310. The chorioid5 is that part of the uvea which lines the posteriorsection of the eye from the ora serrata to the aperture for the optic we observe it in situ, after opening the eyeball and removing the vitreoustogether with the retina, its inner surface appears smooth and uniformlybrown. Then, if we try to strip it off from the sclera, we notice that at sev-eral spots it is attached more firmly than at others. The most intimate con-nection is at the margin of the aperture for the optic nerve; in addition,loose attachments exist i
Text-book of ophthalmology . HE UVEA 375 (c) Chorioid310. The chorioid5 is that part of the uvea which lines the posteriorsection of the eye from the ora serrata to the aperture for the optic we observe it in situ, after opening the eyeball and removing the vitreoustogether with the retina, its inner surface appears smooth and uniformlybrown. Then, if we try to strip it off from the sclera, we notice that at sev-eral spots it is attached more firmly than at others. The most intimate con-nection is at the margin of the aperture for the optic nerve; in addition,loose attachments exist in the places where vessels and nerves enter thechorioid from the sclera, and especially in the region of the posterior pole(region of the posterior ciliary arteries) and of the equator (venae vorticosae).When, after tearing away these connections, we have separated the chorioidfrom the sclera, we get a view of the outer surface of the chorioid, which hasa shaggy appearance on account of the shreds of membrane adhering to Fig. 149.—Cross Section through the Chorioid. Magnified 175 X chorioid consists of the suprachorioid, s, the layer of large vessels, H, the layer of medium-sized vessels, <S, the chorio-capillaris, R, and the lamina vitrea, G. In the layer of large vessels arerecognizable arteries, A, veins, V, and pigment cells, p. The inner surface of the chorioid is coveredby the pigment epithelium, P, its outer surface by the sclera, sc. 311. Microscopical Anatomy.—The chorioid consists of five layerswhich succeed one another in the following order, proceeding from withoutinward: 1. The suprachorioid (s, Fig. 149) consists of numerous minute non-vas-cular but richly pigmented lamellae lying between the chorioid proper andthe sclera (sc). Upon stripping these latter apart these lamellae are torn intwo, and are left hanging partly upon the inner surface of the sclera, partlyupon the outer surface of the chorioid, which thus acquires the rough,shaggy aspect a
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecteye, booksubjectophth
