. Human embryology and morphology. Embryology, Human; Morphology. SENSE OF SIGHT. 179 rain (Fig. 153). It will thus be seen that the optic nerves and esieles are of the same origin as the cerebral vesicleâboth repre- ssing parts of the wall of the fore-brain. (5) The pigmentary layer of the retina is formed from the asheathing or outer layer of the optic cup (Fig. 146). At rst the wall of the optic vesicle is composed of a single layer of pithelium ; the outer or pigmentary layer of the retina retains lis embryonic form. uvea lens, optic, cup -' optic, stalk-. or nerve j. pars ciliar. ret cavi
. Human embryology and morphology. Embryology, Human; Morphology. SENSE OF SIGHT. 179 rain (Fig. 153). It will thus be seen that the optic nerves and esieles are of the same origin as the cerebral vesicleâboth repre- ssing parts of the wall of the fore-brain. (5) The pigmentary layer of the retina is formed from the asheathing or outer layer of the optic cup (Fig. 146). At rst the wall of the optic vesicle is composed of a single layer of pithelium ; the outer or pigmentary layer of the retina retains lis embryonic form. uvea lens, optic, cup -' optic, stalk-. or nerve j. pars ciliar. ret cavity of vesic. outer or pigment layer. inner or inuag. layer Fig. 146.âDiagrammatic Section of the Optic Cup and Lens. (c) The uvea is the layer of pigmented epithelium which covers le posterior surface of the iris. It is formed out of both outer id inner layers of the optic cup, and represents the rim of the jp (Fig. 146). (d) The Pars ciliaris retinae is formed out of that part of the mer or invaginated layer of the optic cup which lies in the ladow of the iris, and is therefore inaccessible to light rays. ; also retains the primitive columnar form of the epithelium. he ora serrata marks the junction of the pars ciliaris retinae id sensitive retina. Ciliary Processes.âAt the commencement of the third month, le pars ciliaris retinae becomes plicated or puckered into 60 or 0 small folds ; mesoblast of the middle tunic (choroid) grows to the puckers and forms the ciliary processes. It should be iserved that the lens lies within the optic cup and the ciliary â ocesses are formed round the equator or circumference of the QS. («) The Sensitive Retina is formed out of the inner or in- iginated layer of the optic cup (Fig. 146). At first the inner. 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 Keith, Arthur
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