. A text-book of physiology : for medical students and physicians . Fig. 67.—Kollikers schema to showthe direct reflex arc. It shows the pos-terior root fiber (black) entering thecord, dividing in Y. and connecting withmotor cells (red) by means of collater- Fig. 68. —Kollikers schema toshow the reflex arc with intercal-ated tract cells. Posterior root fiber,black; intercalated tract cell, blue;motor cells, red. exhibit reflex movements that are most interesting. The funda-mental characteristics of reflex movements in their relations to theplace, intensity, and quality of the stimulus can be s
. A text-book of physiology : for medical students and physicians . Fig. 67.—Kollikers schema to showthe direct reflex arc. It shows the pos-terior root fiber (black) entering thecord, dividing in Y. and connecting withmotor cells (red) by means of collater- Fig. 68. —Kollikers schema toshow the reflex arc with intercal-ated tract cells. Posterior root fiber,black; intercalated tract cell, blue;motor cells, red. exhibit reflex movements that are most interesting. The funda-mental characteristics of reflex movements in their relations to theplace, intensity, and quality of the stimulus can be studied withmore ease upon an animal whose cord is thus severed from thebrain than upon a normal animal. In the latter case the connec-tions in the nervous system are more complex and the reactionsare therefore less simple and less easily kept constant. Spinal Reflex Movements.—The reflex movements obtainedfrom the spinal cord or from other parts of the central nervous systemmay be divided into three groups by characteristics that are physio-logically signif
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