The exterior of the horse . Fig. 64.—Scheme of the muscular incidences in the straight arm, A, and in the oblique arm, B. 1, Extensors of the humerus ; 2, flexors; 3, flexors of the forearm ; 4, extensors, and the canon to evolve themselves completely. It obliges the horseto multiply his movements and elevate the members excessively,instead of being advanced without describing too great a curvature,—aloss of both time and energy. But a very oblique arm gives a better insertion for the musclesthan a straight one, as can be demonstrated by an examination f thetwo diagrams (A and B) of Fig. 64, u
The exterior of the horse . Fig. 64.—Scheme of the muscular incidences in the straight arm, A, and in the oblique arm, B. 1, Extensors of the humerus ; 2, flexors; 3, flexors of the forearm ; 4, extensors, and the canon to evolve themselves completely. It obliges the horseto multiply his movements and elevate the members excessively,instead of being advanced without describing too great a curvature,—aloss of both time and energy. But a very oblique arm gives a better insertion for the musclesthan a straight one, as can be demonstrated by an examination f thetwo diagrams (A and B) of Fig. 64, upon Avhich are indicated theflexors and the extensors of the humerus and the radius ; its nuisdes,however, are shorter. It is also not disadvantageous in horses fromwhich great force is exacted. The degree of brachial inclination, on the other hand, having an 218 THE EXTERIOR OF THE Fig. 65. influence on the value of the seapulo-humeral angle, it may be askedif, for velocity or speed, a straight shoulder will not in a measure becompensated by an excess of obliquity of the arm. In other words, isit rational to prefer (Fig. 65) an angle A OB to an angle COD, both iuiving the same dimension ? Evi-dently it is : to a straight arm anoblique shoulder ; this is the law,and for several reasons already will recall them : An obliqueshoulder will augment the elevationand extension of its point, from thesame quantity of muscular contrac-tion ; whence it follows that the in-ferior extremity of the member willbe carried more in advance of itsprimitive position. As the straight-ening of the humerus also tends tothe same result, the two acting in uni-son will increase the total amplitudeof the , on the contrary, the conditions be the reverse, if the arm bevery oblique and the shoulder straight, the seapulo-humeral angle,although equal to the preceding, will
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecthorses, bookyear1892
