. Materia medica : pharmacology, therapeutics and prescription writing for students and practitioners. Fig. 34.—Kollikers schema to show the reflex arc. A shows the posteriorroot-fiber (black) dividing and spreading up and down the cord, and connectingwith many motor cells (red) through its synapses (black ramifications). B showsthe posterior root-fiber connecting through the first synapse of the afferent sys-tem with an intermediate neuron (green), which in turn connects with numerousmotor cells (red) through its synapses (after Howell). neither on the motor cells themselves nor on the synaps
. Materia medica : pharmacology, therapeutics and prescription writing for students and practitioners. Fig. 34.—Kollikers schema to show the reflex arc. A shows the posteriorroot-fiber (black) dividing and spreading up and down the cord, and connectingwith many motor cells (red) through its synapses (black ramifications). B showsthe posterior root-fiber connecting through the first synapse of the afferent sys-tem with an intermediate neuron (green), which in turn connects with numerousmotor cells (red) through its synapses (after Howell). neither on the motor cells themselves nor on the synapses aboutthe motor cells; and is in all probability on either the intermediaryneurons in the cord or the first synapses of the afferent system. If the dose given is just a little less than enough to produceconvulsive twitching, the response of the usual muscles is greaterthan normal, but in the usual purposeful way; and this is be-lieved to be due to the greater transmission of the afferent im-pulses. There is no satisfactory evidence that the motor cellsthemselves are stimulated. NUX VOMICA 259
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