Identifier: handbookofphysio00bake (find matches)
Title: Hand-book of physiology
Year: 1892 (1890s)
Authors: Baker, W. Morrant, (William Morrant), 1839-1896 Harris, Vincent Dormer Kirkes, William Senhouse, 1823-1864. Hand-book of physiology. 13th ed
Subjects: Physiology Human physiology
Publisher: London : John Murray
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Fig. 414.—Laminated structure ofthe crystalline lens. The laminse-are split up after hardening inalcohol. 1, the denser centralpart or nucleus; 2, the succes-sive external layers. ^. (Arnold.) Of series of concentric 720 THE SENSES. (ch. xvn. The epithelium of the lens consists of a layer of cubical cellsanteriorly, which merges at the equator into the lens fibres. Thedevelopment of the lens explains this transition. The lens at firstconsists of a closed sac composed of a single layer of epithelium.The cells of the posterior part soon elongate forwards and obliteratethe cavity, the anterior cells do not grow, but at the edge theybecome continuous with the posterior cells, which are graduallydeveloped into fibres. The lens contains globulin or crystallin,
Text Appearing After Image:
Fig. 415.—Meridional section through the lens of a rabbit. 1, Lens capsule ; 2, epitheliumof lens; 3, transition of the epithelium into the fibres; 4, lens fibres. (Bubuchin.) but no native-albumin ; it also contains cholesterin. The capsule isa homogeneous transparent elastic membrane. The hardest portionof the lens is that which is most internal. It forms the so-callednucleus of the lens (fig. 4.14, 1). Corneoscleral junction.—At this junction the relation of parts(fig. 412) is so important as to need a short description. In theneighbourhood, the iris and ciliary processes join with the cornea.The proper substance of the cornea and the posterior elastic laminabecome continuous with the iris, at the angle of the iris, and theiris sends forwards processes towards the posterior elastic lamina,forming the ligamentum pectinatum iridis, and these join withfibres of the elastic lamina. The endothelial covering of theposterior surface of the cornea is, as we have seen, continuousover th

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