The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . artilage allows motion inevery direction. Now the shape of the ribs is sopeculiar, being a sort of double curve, that whenthey are raised at the sides, the ends which join thebreastbone are pushed forward, and of course carrythe breastbone with them„ So it is evident that atevery inspiration the diameter of the chest increasesfrom fr
The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . artilage allows motion inevery direction. Now the shape of the ribs is sopeculiar, being a sort of double curve, that whenthey are raised at the sides, the ends which join thebreastbone are pushed forward, and of course carrythe breastbone with them„ So it is evident that atevery inspiration the diameter of the chest increasesfrom front to rear as well as from side to side. 25. Natural Shape of the Chest.—In 3oung peo-ple the cartilages are soft, but thev grow harder asage advances, and become partially turned intobone. In youth they yield to pressure to such anextent that by tight lacing the shape of the chest issometimes made exactly the reverse of what it oughtto be (Fig. 13). The ribs naturally form a cone, withthe smaller end uppermost, but it is not uncom-mon to see the smaller end at the waist. Na-ture will endure a great deal of meddling, but it 24 ORGANS OF MOTION. is not always safe to trifle with her, and all personswho carry tight lacing too far will inevitably 26. The Limbs.—More than one half of thebones in the body are found iu the Innbs. Out of twohundred bones, they contain one hundred and twen-ty-six, and these are so constructed and so arrangedas to afford a great variety of movement. The up- THE JOINTS. 25 per and lower limbs are what is called Jiomologotisin their parts—i. e., each bone in the arm has itscounterpart in the leg, with onh slight apparentexceptions. Thus,the shoulder-bladecorresponds to thebody of the hip-bone,the collar-bone to thefront of the hip, thearms to the thigh,the two bones of thefore-arm to the twoof the leg, the wristto the ankle, and thehand and fingers tothe foot and similarity andcorrespondence ofthese parts are quiteclear in the s
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