. Outlines of zoology. Zoology. /.- Fig. 192.—Development of the eye.—After Balfour and Hertwig. 1. Section through first embryonic vesicle, showing outgrowth of optic vesicles (o^.v.) to meet the skin ; , thalamen-cephalon ; G., the gut. -4. Sections illustrating the formation of the lens (/.) from the skin, and the modification of the optic vesicle into an optic cup ; R., retina ; , vitreous humour. 5. External aspect of embryonic eye ; /., lens. very complex structure, with several layers of cells, partly supporting and partly nervous ; the layer next the vitreous humour consists of
. Outlines of zoology. Zoology. /.- Fig. 192.—Development of the eye.—After Balfour and Hertwig. 1. Section through first embryonic vesicle, showing outgrowth of optic vesicles (o^.v.) to meet the skin ; , thalamen-cephalon ; G., the gut. -4. Sections illustrating the formation of the lens (/.) from the skin, and the modification of the optic vesicle into an optic cup ; R., retina ; , vitreous humour. 5. External aspect of embryonic eye ; /., lens. very complex structure, with several layers of cells, partly supporting and partly nervous ; the layer next the vitreous humour consists of nerve-fibres, while that furthest from the rays of light and next the pigment epithelium consists of sensitive rods and cones. The region where the optic nerve enters, and whence the fibres spread, is called the blind spot, and near this there lies the most sensitive region—the yellow spot, with its fovea centralis, where. 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 Thomson, J. Arthur (John Arthur), 1861-1933. Edinburgh, Glasgow and London, H. Frowde and Hodder & Stoughton
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Keywords: ., bookauthorth, bookcentury1800, bookdecade1890, booksubjectzoology
