Excerpt from A Study of the Knee Jerk<br><br>By the same method the efferent conduction path was found in the anterior roots of the fifth and fourth lumbar nerves of the Rhesus (fourth and third of man) and was traceable along the anterior crural nerve into those of the muscular branches of that trunk which supply the vastus internus and crureus divisions of the quadriceps, i. E., in exactly the same muscles in which the afferent condition path has its peripheral termination.<br><br>Pathological evidence, offered by cases presenting degeneration of posterior nerve roots and certain portions of the posterior columns of the cord in which the knee jerk is observed to be entirely absent, makes it clear that the spinal center involved in the knee jerk mechanism is situated somewhere between the second and fifth lumbar segments inclusively. Mills2 agrees with Edinger, Starr and others in placing it in the second or third lumbar segments or probably both.<br><br>About the Publisher<br><br>Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com<br><br>This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.