La Mano : il suo meccanismo vitale e dotazioni, come manifestare la progettazione, e che illustra la potenza, la saggezza e la bontà di Dio . che essi sono utili anche m subservienceto l'organo di contatto; che forniscono una potenza ofreceiving impressioni, senza la quale la massima deli-cacy dei nervi sarebbero inefficaci. La proiezione del tallone del piede umano e theprominence del ginocchio pan, sono disposizioni per incrementato-ing, mediante regolazione meccanica, il potere di themuscles. Mediante tali mezzi del punto di inserimento di themuscle viene rimosso ad una distanza dal centro ofmotion nel giunto e la leva

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The hand : its mechanism and vital endowments, as evincing design, and illustrating the power, wisdom, and goodness of God . that they are useful also m subservienceto the organ of touch; that they provide a power ofreceiving impressions, without which the utmost deli-cacy of the nerves would be unavailing. The projection of the heel in the human foot, and theprominence of the knee pan, are provisions for increas-ing, by mechanical adjustment, the power of themuscles. By such means the point of insertion of themuscle is removed to a distance from the centre ofmotion in the joint, and the lever power thus obtainedis added to the force of the muscle. The principle ismaintained, and the demonstration more easy, in thejoints of some animals, as in the hock of the horse; andwe have a beautiful instance of it in the foot of the 134 MECHANICAL PROPEETIES ostrich. Where the flexor tendons pass behind theseveral joints of the foot, the heads of the bones areenlarged; wliich throws the tendons off from the centreof motion. But there is an additional provision still.A loose pendulous body, A, hangs between the tendons. OSTEICH S FCOT. and bone, at each of these joints ; and it plays upon thebones in such a manner, that at the utmost degree ofextension of the foot, when the bird requires to use allits power of muscular exertion to bend it again, thisbody is introduced to throw the tendons further back- cHip.iv, OF THE MUSCLES. 135 wards, and to add remarkably to the lever power. Thisbody, A, is shaped like a wedge, with grooved surfacesto correspond with the bone before, and the tendonbehind: and it is suspended by an appropriate muscle, which raises it hke a bolt, after it has served the officeof throwing off the tendons from the centre of motion.In addition, the sketch shows, that where these tendonspass behind the joints, they are thickened and hardenedinto cartilages, so that the bolt operates more effectuallyin directing them backwards, and producing the pro-jection, equiva

Parole chiave associate all'immagine

• bo
• bookcentury1800
• bookdecade1870
• booksubjecthand
• bookyear1874