Some considerations on the structure of quadruped extremities

Abstract

An attempt is made to develop a general theory of the structure of an extremity of a quadruped or biped, based on its mechanical function. The problem is essentially one of dynamics of a chain of linked levers. The equations of motions of such systems are practically insoluble exactly at the present time. A very crude approximation method is therefore outlined. It is shown that, theoretically, the number of links in the chain forming the extremity may be determined by the optimum use of the total available force of the flexors and extensors. Discussion of the formula derived from this point of view shows, however, that actually this is not the determining factor. Other theoretical possibilities are discussed. While no application can be made at present, yet in principle it is shown how mechanical consideration can throw light on the anatomical structure of the extremity.