A text-book of first aid and emergency treatment . fibers. TJw Action of the Nerves.—This is usually very compli-cated even for the simplest voluntary action. For the pur-pose of description the nerves may be likened to electricwires and the brain to the battery. A nerve impulseoriginated in the peripheral ending of a sensory nerve istransmitted to the brain, where it is transformed to a motor rilE NERVOUS SYSTliM 55 impulse, and this motor impulse is transmitted to a musclewhich contracts, resulting in motion. If, for example, the. LUMBAR GANCLfA Fig. 22.—Spinal cord showing nerve roots. (Ger
A text-book of first aid and emergency treatment . fibers. TJw Action of the Nerves.—This is usually very compli-cated even for the simplest voluntary action. For the pur-pose of description the nerves may be likened to electricwires and the brain to the battery. A nerve impulseoriginated in the peripheral ending of a sensory nerve istransmitted to the brain, where it is transformed to a motor rilE NERVOUS SYSTliM 55 impulse, and this motor impulse is transmitted to a musclewhich contracts, resulting in motion. If, for example, the. 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
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