A text-book of first aid and emergency treatment . LUMBAR GANCLfA Fig. 22.—Spinal cord showing nerve roots. (Gerrish.) 56 ANATOMY AND PHYSIOLOGY hand is burned the sensation is transmitted at onee to thebrain and the proper motor impulse started ^^?hich results. Fig. 23.—Diagrammatic sketch showing the course of a nerve , visual center; A, auditory center; W, writing center; Z, vocal center;a and v are sensory fibers conducting sound and visual perception; s, s ands, are sensory nerve fibers from the skin of the mouth, hand and eje; mand 711 are motor fibers to the mouth and to the ha
A text-book of first aid and emergency treatment . LUMBAR GANCLfA Fig. 22.—Spinal cord showing nerve roots. (Gerrish.) 56 ANATOMY AND PHYSIOLOGY hand is burned the sensation is transmitted at onee to thebrain and the proper motor impulse started ^^?hich results. Fig. 23.—Diagrammatic sketch showing the course of a nerve , visual center; A, auditory center; W, writing center; Z, vocal center;a and v are sensory fibers conducting sound and visual perception; s, s ands, are sensory nerve fibers from the skin of the mouth, hand and eje; mand 711 are motor fibers to the mouth and to the hand. The nerve impulsemay Ije traced as follows: The object is seen and the impulse carried tothe visual center and transmitted to the writing center which starts theimpulse to the hand which, under the action of the impulse, writes the the same way the name of the object seen may be spoken; or the impulsemay start by a sense of touch or hearing and result in any form of volunlaryaction. in the hand beino; drawn away from the hot object. This isdone so quickly that it ai)i)ears as though the action andthe sensation occurred simultaneously, but, as a matter of THE NERVOUS SYSTEM 57 fact, there is an apprecial)le time elapsing between themoment th
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