Human physiology : designed for colleges and the higher classes in schools and for general reading . ion to a side view of the muscles of thebody as presented in Fig. 122. I must premise, that you canget no idea from this Figure of the number of the muscles inthe body, for you see here only the outer layer of muscles, andthere are many muscles concealed by them. You observe thatthey are of various shapes and sizes, according to the motionswhich they are designed to produce, and the circumstancesin which they are placed. They are round, long, short, flat,fan-shaped, circular, serrated, &c. I wi
Human physiology : designed for colleges and the higher classes in schools and for general reading . ion to a side view of the muscles of thebody as presented in Fig. 122. I must premise, that you canget no idea from this Figure of the number of the muscles inthe body, for you see here only the outer layer of muscles, andthere are many muscles concealed by them. You observe thatthey are of various shapes and sizes, according to the motionswhich they are designed to produce, and the circumstancesin which they are placed. They are round, long, short, flat,fan-shaped, circular, serrated, &c. I will point out someof them. At a is the very large muscle that makes thefleshy prominence at the upper part of the arm, and theoffice of which is to raise the arm, carrying it out from thebody. You observe that its fibres are not all arranged alikebut lie in different directions. The result is, that while thearm is raised by the muscle as a whole, it may be carried atthe same time forward or backward by the varying action of THE MUSCLES. 211 External layer of the muscles of the body. FIG. MUSCLES OF THE BODY. 212 HUMAN PHYSIOLOGY. General description of the muscles in various parts. these different fibres. There are many of the muscles of thebody which are made thus to produce various results byvariation of the action of different parts of the same the regulation of this variation by the nerves is one ofthe most wonderful and mysterious things which we find inour study of the nervous system. For each fibre in the casesreferred to is told, as we may express it, just how much it mustdo in order to produce the requisite general motion of themuscle. It is manifestly much more wonderful thus to pro-duce various but accurately graduated contraction in differentparts of the muscle, than to produce an uniform contraction inall its fibres. 312. I go on with my notice of the particular muscles. At6 is the biceps muscle, which bends the forearm upon the arm,and at c is anot
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