A Text Book of Physiology V.4, 1896
by Michael Foster (9780217670852)

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: cup becomes what we may speak of broadly as the retina, and we may call it the optic or retinal cup; the solid stalk becomes the optic nerve; and the other parts of the eyeball are formed round this retinal cup, which remains as the essential part of the eye. Fig. 134. Diagrammatic Outline Of A Horizontal Section Of The Eye, To Illustrate The Relations Of The Various Parts. The figure is to be regarded as very diagrammatic, more or less distortion of the relative sizes of thi various parts and of the relative thickness of the coats being unavoidable in the effort to secure simplicity. Scl. the sclerotic coat, shaded longitudinally, continuous with the (unshaded) body of the cornea, e.c. the epithelium of the cornea continuous with e cj. the epithelium of the conjunctiva. Ch. the choroid coat, with (.'. P. the ciliary process and 7. the horly of the iris, all stippled to indicate that they are all parts of the same vascular investment. R. the retina or inner wall, and P. E. the pigment epithelium or outer wall of the retinal cup. In front of the wavy line 'AS, marking the position of the ora serrata, the retina proper changes into the pars cilinris retina?, p.c. R. Roth tin- pigment epithelium and the pars ciliaris retina' are represented as continue: over the hack of the iris as well as over the ciliary process. /, . the lens. sp. / the suspensory ligament. The broken line round the Ions. shewn on one side only, represents the membrana capsulo-pupillaris: and the straight continuation of it through 1." //. the vitreous humor to 0. N. the optic nerve indicates the embryonic continuation of the central artery of the retina. o. x. the optic axis, in this case made to pass through the fovea centralisc. The front or inner wall of the retinal cup is fr...

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