. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. i*. RESTING POTENTIAL _i RETINAL ACTION POTENTIALS ELECTRICAL POLARfTY OF VERTEBRATE E-YEL TIME. Fig. 115. Diagrams illustrating QA) the elements in a visual pathway, and (B) the electrical polarity and retinal action potentials of the vertebrate eye. The physiological problems of prime interest center about two parts of the optic pathway (Fig. 115, .4): (1) the photosensitive membrane and im- mediate connecting neurones, , the peripheral structures; and (2) the central nerxous system structures which receix
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. i*. RESTING POTENTIAL _i RETINAL ACTION POTENTIALS ELECTRICAL POLARfTY OF VERTEBRATE E-YEL TIME. Fig. 115. Diagrams illustrating QA) the elements in a visual pathway, and (B) the electrical polarity and retinal action potentials of the vertebrate eye. The physiological problems of prime interest center about two parts of the optic pathway (Fig. 115, .4): (1) the photosensitive membrane and im- mediate connecting neurones, , the peripheral structures; and (2) the central nerxous system structures which receix'e and integrate the activity originating in the retina. The Peripheral Visual Mechanism: The Photochemical Nahire of Photo- reception. Today it is an accepted fact that the initial e\'ent in the process of vision is a photochemical reaction. Surprisinglv, this fact was only recently established. It w^as the evidences presented by Hecht,'^^- ''•^' ''^- '^''- ''^ stemming from his ingenious researches on the marine clam, Mya arenaria, which firmly established the photochemical nature of vision on a factual 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 Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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