. Human physiology (Volume 1) . 336 MUSCULAR MOTION. the effect, is not equal to sixty pounds, but to three times sixty,or one hundred and eighty Action of the , the Scapula ; B, the Os humeri; C, the Deltoid. Figure 88, strikingly exhibits the disadvantages of the deltoid,so far as regards the place of its insertion into the lever ; but manymuscles have insertions much less favourable than the biceps, D, for example, in Fig. 89, — the muscle which bendsthe forearm on the arm, — is attached to the forearm ten timesnearer the elbow-joint, or the fulcrum, than to th
. Human physiology (Volume 1) . 336 MUSCULAR MOTION. the effect, is not equal to sixty pounds, but to three times sixty,or one hundred and eighty Action of the , the Scapula ; B, the Os humeri; C, the Deltoid. Figure 88, strikingly exhibits the disadvantages of the deltoid,so far as regards the place of its insertion into the lever ; but manymuscles have insertions much less favourable than the biceps, D, for example, in Fig. 89, — the muscle which bendsthe forearm on the arm, — is attached to the forearm ten timesnearer the elbow-joint, or the fulcrum, than to the extremity ofthe lever; and if we apply the argument to it, — supposing theweight of the globe, in the palm of the hand, to be fifty-fivepounds and the weight of the limb five pounds, — it would haveto act with a force equal to sixty times ten, or six hundred pounds,to raise the weight. Muscles, again, are attached to the bones at unfavourable they were inserted at right angles in the direction of P P, , the whole power would be effectually applied in moving the Fig. 89.
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectphysiology, bookyear1
