. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Photoreception 405 are so connected that at least certain fish, turtles, anurans (frog), and high- er placentals (cat) ha\e a ph\siological basis for color \ision. These data support the behax'ior evidence for the occurrence of color vision in teleosts and turtles and extend its possibilty to frogs and higher placental mammals. Granit found that the optic nerve fibers of the snake have only one type of cone sensiti\'ity curve. Although the sensitivity cur\es for the snake are bi- modal, the fact that they are al
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Photoreception 405 are so connected that at least certain fish, turtles, anurans (frog), and high- er placentals (cat) ha\e a ph\siological basis for color \ision. These data support the behax'ior evidence for the occurrence of color vision in teleosts and turtles and extend its possibilty to frogs and higher placental mammals. Granit found that the optic nerve fibers of the snake have only one type of cone sensiti\'ity curve. Although the sensitivity cur\es for the snake are bi- modal, the fact that they are all the same precludes the existence oF a phA-sio- logical basis for color \ ision. This is in agreement w iih the data on beha\'ior. PHYSIOLOGY OF PHOTORECEPTION Sensory end-organs which respond to radiation displa\' great morpholog- ical variation. Despite this morphological diversity there exists a common pattern (Fig. 115,A) of a light-focusing de\'ice, a photosensitixe membrane (retina), postretinal neurones which connect the receptor with the central nervous system, and the visual center or centers within the central nervous system. In keeping with this common structural pattern certain similarities in the basic mechanism of the responsive system are revealed in investigations of the function of light-sensiti\'e end-organs, or photoreceptors. RETINA (photosensitive, membrane:) LIGHT. O^ VISUAL CENTFR IN i CENTRAL NERVOUS _^ SYSTEM LIGHT FOCUSING DEVICE GANGLIA AND SYNAPSES IN OPTIC PATHWAY B LIGHT. 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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