A Study of the Knee Jerk (Classic Reprint) - Hardcover

Edwin B. Twitmyer

9780656017256: A Study of the Knee Jerk (Classic Reprint)

Hardcover

ISBN 10: 0656017252 ISBN 13: 9780656017256

Publisher: Forgotten Books, 2018

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Excerpt from A Study of the Knee Jerk

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.

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.

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