. The peninsular and independent medical journal . onnected by a tendon to a clasp and pulley D^ E. The great muscleF is the continuity of the flexor tendons G, H^ /, /, K. These tendonspass sinuously over pulleys or fixed sheaves, 1, 2, 3, 4, 5, through thehand, to the end of the fingers and thumb. The principles of the leverand pulley are thus combined, and the maximum power retained at allangles of flexion or extension. A slight motion of the shoulders, withextension of the Fore-arm, produces an incredible grasp, as seen inFig. 3. An object of any shape, such as a pen, a fork, or an apple i
. The peninsular and independent medical journal . onnected by a tendon to a clasp and pulley D^ E. The great muscleF is the continuity of the flexor tendons G, H^ /, /, K. These tendonspass sinuously over pulleys or fixed sheaves, 1, 2, 3, 4, 5, through thehand, to the end of the fingers and thumb. The principles of the leverand pulley are thus combined, and the maximum power retained at allangles of flexion or extension. A slight motion of the shoulders, withextension of the Fore-arm, produces an incredible grasp, as seen inFig. 3. An object of any shape, such as a pen, a fork, or an apple is heldwith facility. By a slight motion of the shoulders the belt A B causesthe great muscle F, and its tendons, to contract powerfully, closing thehand. A movement easily and naturally made actuates the tendon G 6^2and fastens the clasp D upon the muscle so as to retain the grasp inany position or motion of the arm, when in use. This is regarded asinvaluable for holding reins in driving, or carrying articles with safety. Editorial Department. 25. 26 The Peninsular and Independent, An easy counter - motion unfastens the clasp^ relaxing the flexor muscleand its tendons, and the extensors open the hand. This principle per-forms most perfectly in an arm applied below the elbow, as in Fig. 3. Fig. 3. In this are seen the belt A B C^ the great muscle F andits tendons, the clasp and pulley i), E^ as in Fig. 2. A fixed eyelet, j?^2,clasps the great muscle F and thus guides the flexor tendons of thofingers. The line 1, shows the union of the natural with the artificialarm. Fig. 4 shows a hand holding a fork. The tendon A A^ pa^eathrough the clasp B^ and around the pulley (7, to the side of the clasp D,where it fastens or unfastens the clasp, by movements before joints of the fingers and thumb are flexed upon the fork, by powerfultension of the great muscle and its tendons. The sinuosity of the tendonspassing over the pulleys or sheaves, F^ E, E^ shows the new and usefulpr
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Keywords: ., bookcentury1800, bookdecade185, booksubjectmedicine, bookyear1859
