. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. So MORPHOLOGY OF THE ORGANS OF VERTEBRATES. ganglion cells in their turn produce from these outer or free surfaces axons which rapidly grow from the cells to the choroid fissure (thus forming a layer of nerve fibres over the ganglion cells), and thence, through the groove in the optic stalk, to the brain. These axons form the optic nerve,^ which, as will readily. Fig. 86. Retinal elements, after Ramon yCajal. BC, bipolar cone cell; BR, bipolar rod cell; C, cone; CF, centrifugal fibre; G, ganglion cell layer; H, hori- zontal
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. So MORPHOLOGY OF THE ORGANS OF VERTEBRATES. ganglion cells in their turn produce from these outer or free surfaces axons which rapidly grow from the cells to the choroid fissure (thus forming a layer of nerve fibres over the ganglion cells), and thence, through the groove in the optic stalk, to the brain. These axons form the optic nerve,^ which, as will readily. Fig. 86. Retinal elements, after Ramon yCajal. BC, bipolar cone cell; BR, bipolar rod cell; C, cone; CF, centrifugal fibre; G, ganglion cell layer; H, hori- zontal cell; IG, inner granular layer ; /J/, inner molecular layer; X, nerve fibres ; OG, outer granular layer : 0.)/, outer molecular layer: R, rods; S, supporting cells. be understood, appears, after the closure of the choroid fissure, as if it left the e}e through the centre of the retina. As all sense cells are lacking at the point of exit of the optic nen-e, this region forms the ' blind spot' described in all physiological text-books. 1 It was formerly thought that the optic nerve arose by a modification of the cells of the optic stalk. Later, nerve fibres were described as growing from the brain to the eve; but while some fibres may arise in this way, the majority arise as described above. So far as method of nerve formation is concerned, the optic nerve resembles the dorsal root of a spinal nerve (pp. 47 and 60, foot-note.). 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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