. A text-book in general physiology and anatomy. Physiology, Comparative; Anatomy. THE KEFLEX AKC 413 ness may accompany the action, it does not determine the action. Many actions which are at first voluntary may become reflex by repetition; and, in fact, one of the funda- mental features of education is concerned in making reflex or habitual, actions which in the child are voluntary and require effort of will on his part. The reflex arc.— The spinal cord is the seat of most of the reflex actions of the organs of the trunk and Fig. 191. — A spinal reflex. The relation of the nerve elem
. A text-book in general physiology and anatomy. Physiology, Comparative; Anatomy. THE KEFLEX AKC 413 ness may accompany the action, it does not determine the action. Many actions which are at first voluntary may become reflex by repetition; and, in fact, one of the funda- mental features of education is concerned in making reflex or habitual, actions which in the child are voluntary and require effort of will on his part. The reflex arc.— The spinal cord is the seat of most of the reflex actions of the organs of the trunk and Fig. 191. — A spinal reflex. The relation of the nerve elements in simple reflexes which have their origin in the cord, is shown in Figure 194, and the relation there shown is typical of all reflex actions. In this figure it will be seen that the posterior root of the spinal nerve has on its surface a swelling which was called the spinal ganglion. This ganglion contains many bipolar nerve cells whose axones extend in different directions. One axon passes out and forms one of the sensory fibers of the spinal nerve. It terminates in some form of an end organ. The other terminates in a brush in the gray matter of the cord. Likewise, in the anterior cornua of the cord is found a unipolar nerve cell whose dendrites are in. 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 Eddy, Walter Hollis, b. 1877. New York, Cincinnati [etc. ] American book Co
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