4) passes from a projectingprocess on the outer side of the arm-bone to theinner edge of the radius near its upper part. It thuspronates the hand, and is called a pronator muscle.Another muscle (B, fig. Its contraction causes theradius to roll over, or in front of, the ulna. 3)passes from a projecting process on the inner side ofthe arm-bone, at its lower end, to the outer edge ofthe middle of the radius. must notice the three muscles by which they arechiefly affected. In both figures, a plumb-linefrom the outer condyle of thehumerus is found to traversethe lower end of the ulna andthe ring-finger. 4.The same in a state of pronation.B, the short supinator muscle. The upper limb, with the forearm and hand in the state of supination. These movements of pronation and supination areso important to the usefiUness of the hand, that we Fig. Inpronation (derived from promts, with the face down-wards), we turn the palm of the hand downwards, as in picking up any substance from the table insupination (derived from suyinus, with the faceupwards), we turn the palm upwards, as for thepiu-pose of receiving anything that may be placedin it. The movements inquestion are called pronation and supination. We have next to consider aclass of movements of the foreai-m and hand, towhich there is nothing analogous (at least to any-material extent) m the leg. This image could have imperfections as it’s either historical or reportage.Ĭhambers's encyclopædia a dictionary of universal knowledge. Alamy charges you a fee for access to the high resolution copy of the image. This image is a public domain image, which means either that copyright has expired in the image or the copyright holder has waived their copyright.
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