File:Treatise on the diseases of the eye, including the anatomy of the organ (1868) (14578294310).jpg

Identifier: treatiseondisea00stel (find matches)
Title: Treatise on the diseases of the eye, including the anatomy of the organ
Year: 1868 (1860s)
Authors: Stellwag von Carion, Karl, 1823-1904 Hackley, Charles E. (Charles Elihu), 1836-1925 Roosa, D. B. St. John (Daniel Bennett St. John), b. 1838
Subjects: Eye
Publisher: New York, W. Wood & co.
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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The crystalline lens may be divided, parallel to its surface,into layers of unequal thickness, and thus has the appearance ofbeing composed of layers inclosed in each other, as an onion does.These surround a small nucleus. These layers are composed oflens-filaments, which are long and hexagonal on transversesection, and flattened filament-cells, very pellucid, flexible, anddelicate, which are exceptionally pointed at both ends, but areusually flat, pressed together laterally, and so have many forms.(Fig. 84, after Kolliker.) ■ Each of these elements originally proceeded from one cell, and stillhas the characteristic cell-nucleus (except in case of the central filament). The nuclei all lie inthe part of the lens-filament that is near the equator, but at different hights; hence they do notcause any particular swelling of the lens at this point. Their collection in a proportionatelysmall zone of the periphery of the lens justifies the anatomical distinction of a nuclear gone. Fig. 84.
Text Appearing After Image:
494 ANATOMY OF THE CRYSTALLINE LENS. Fig. 85. (H. Meyer.) The formation of new lens-elements appears to proceed from this part. This is saidto be going on very rapidly at birth, and many cells in process of division, and young elementscan be seen as small round cells, which gradually elongate and grow to the characteristic six-sidedtubes. (Moers, F. Becker.) But the crystalline only grows in an equatorial direction; it*hasalready attained its size in the antero-posterior diameter. (Sappey, Ed. Jaeger.) The filaments are generally S-shaped, and each one belongs to both halves of the lens, sincewithout exception they pass over the equator of the layer they form in, and curve from one half tothe other. They run close together, and a section made perpendicular to their course gives theappearance of a delicate mosaic, consisting of small hexagonal plates. Their edges are dentate,and overlap each other, and hence are more intimately connected than the smooth surfaces, ofwhich the two broade

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