Synopses & Reviews
Synopsis
Excerpt from The American Journal of Physiology, Vol. 20
This research does not deal with the action of muscles under physi ological conditions, but with the mechanical effects of the shortening of individual muscles.
All of the infinite number of positions which the bones entering into the hip and knee joints can take with respect to each other can be reached by appropriate muscular action. It would be, however, impossible to determine experimentally the exact method of action of each of the muscles which takes part in placing the leg in each of these innumerable positions, or to ascertain what would be the action of each of the muscles when the leg occupied each of these positions.
In this research the attempt was made to find out what kinds of movements could be caused by contraction of the muscles of the thigh when the bones entering into the hip and knee joints occupied certain definite positions. In the case of the muscles which act on the hip, for example, when the pelvis was fixed and the thigh was free to move, under each of the following conditions, namely.
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