The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 110 THE THIRD DAY. [chap. epiblast furnishes the body of the cornea, the epiblast itself remaining as the anterior corneal epithelium. A portion of mesoblast, carried in from the front by the lens during its involution, gives rise to the capsule of the lens and suspensory ligament, while some mesoblast entering on the under side through the choroidal fissure becomes (in birds) tlie pecten, and probably also contributes to the vitreous humour. Of the walls of the optic cup, the thinner outer (poste
The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 110 THE THIRD DAY. [chap. epiblast furnishes the body of the cornea, the epiblast itself remaining as the anterior corneal epithelium. A portion of mesoblast, carried in from the front by the lens during its involution, gives rise to the capsule of the lens and suspensory ligament, while some mesoblast entering on the under side through the choroidal fissure becomes (in birds) tlie pecten, and probably also contributes to the vitreous humour. Of the walls of the optic cup, the thinner outer (posterior) wall becomes, behind the line of the ora serrata, the pigment- epithelium of the choroid, while the thicker inner (anterior) wall supplies all the elements of the retina, including the rods and cones which grow out from it into the pigment- epithelium. Fig. 32. jy cv AOA Section through the Hind-Brain of a Chick at the end of the Third Day of Incubation. IV. Fourth ventricle. The section shews the very thin roof and thicker sides of the ventricle. Ch. Notochord—(diagrammatic shading). CV. Anterior cardinal vein. GC. Involuted auditory vesicle. CC points to the end which will form the cochlear canal. BL. Eecessus labyrinthi. hy. Hypoblast lining the alimentary canal. AO, AOA. Aorta, and aortic arch.
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