. Carnegie Institution of Washington publication. 44 BUM' AND THEIR EYES. The Lens. -- The lens has retained its natural shape and position (lens, fig. 14). Tt is almost spherical and measures So fj. in diameter. In most of the sections an outer layer of cells extends around the anterior surface of the lens. The interior in nearly every case stained as a structureless mass, but in a few sections it appeared to be made up of large irregularly shaped cells with small nuclei. If any fibrous cells still persisted, they did not show. No capsule is FIG. 1 Horizontal Section of
. Carnegie Institution of Washington publication. 44 BUM' AND THEIR EYES. The Lens. -- The lens has retained its natural shape and position (lens, fig. 14). Tt is almost spherical and measures So fj. in diameter. In most of the sections an outer layer of cells extends around the anterior surface of the lens. The interior in nearly every case stained as a structureless mass, but in a few sections it appeared to be made up of large irregularly shaped cells with small nuclei. If any fibrous cells still persisted, they did not show. No capsule is FIG. 1 Horizontal Section of Eye showing Different Parts. Retina diagrammatic. For explanation of letters see fig. 13. I In Vilreous Body. - The vitreous body (ml., fig. 14) occupies the greater part the eyeball and has certainly undergone but little change. The aqueous cavity entirely disappeared. - Only the uvcal part of the iris remains. It is continuous with the pigment epithelium of the retina and has the same structure. In the thickest part it measures 68 The cells are similar to those of the pigment layer, except that their radial diameter is much greater. The ciliary processes are no longer present. 'I In Of'tii Nerve. -The optic nerve can be traced from the eye, through and along the >ide of I larder's gland. While the nerve could be traced no farther on account of an incomplete series of sections, there is no doubt that the connection The nerve fibers enter the eye in a compact mass, pass through the layers of the retina until they reach the nerve fiber layer, where they. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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