. The animans and man; an elementary textbook of zoology and human physiology. FIG. 182. Diagram showing relation ofcenters of language and their principalassociations. A, auditory center; V, visualcenter; M, motor speech center; E, motorwriting center; O. O., intellectual center.(After Grasset.) a nerve ending in some part of the body, as in the retina of the eye. Visual stimuli are carried along the axis cylinders of the nerves to the 364 THE ANIMALS AND MAN cortex of the brain where the center of sight, or visual center,is located. The cells in the visual center transmit the im-pulse to its
. The animans and man; an elementary textbook of zoology and human physiology. FIG. 182. Diagram showing relation ofcenters of language and their principalassociations. A, auditory center; V, visualcenter; M, motor speech center; E, motorwriting center; O. O., intellectual center.(After Grasset.) a nerve ending in some part of the body, as in the retina of the eye. Visual stimuli are carried along the axis cylinders of the nerves to the 364 THE ANIMALS AND MAN cortex of the brain where the center of sight, or visual center,is located. The cells in the visual center transmit the im-pulse to its dendrites. These dendrites are in contact withdendrites from the auditory centers, the intellectual center,the speech centers, etc. Any of these dendrites or all ofthem may be stimulated. The stimulation might thusresult in speech, or in motion with the hands or feet, or itmight produce a thought (fig. 182). The manner in which nervous impulses originate isunknown, but it is believed to be due to the character ofthe metabolism of the nerve cells. Classification of nerve fi
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