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 . he ridge of bonerunning backward from the lower border of theeye toward the ear, and below to the horizontalportion of the jaw. The muscle is nearly square inshape, and, as is easily seen, acts at a great mechan-ical advantage. As a matter of interest connectedwith this muscle, it may be stated that it is the mus-cle generally referr
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 . he ridge of bonerunning backward from the lower border of theeye toward the ear, and below to the horizontalportion of the jaw. The muscle is nearly square inshape, and, as is easily seen, acts at a great mechan-ical advantage. As a matter of interest connectedwith this muscle, it may be stated that it is the mus-cle generally referred to for proof that muscularcontraction is accompanied by a sound. If thelower jaw be firmly closed, and the teeth powerfullypressed together so that the muscles of masticationare strongly contracted, a low, rumbling sound willbe heard, which can not be explained in any otherway than as caused by the muscular contraction. 89. The Saliva.—In the third place, the food,while undergoing mastication, is mixed with cer- MASTIC. I —SIVALLO WING. 69 tain fluids, called collectively the saliva. They arethe product of three sets of glands, each of whichis double—i. e., there are three glands on each sideof the mouth (Fig. 21), and the secretion of each. Fig. 21.—The salivary- glands of the right side. pair is peculiar to itself. The largest of these are\\\Q par of id glands, which are situated just in frontof the lower border of the ears, and are the glandswhich become swollen and cause the distortion ofthe face in the disease known as the mumps. Thefluid secreted by these glands is very thin andwatery, and constitutes the greater part of the sar6 70 ORGANS OF REPAIR, liva. The other glands* are situated just inside thelower border of the jaw and beneath the secretion is much thicker and more glutinousthan that of the parotid glands. Besides thesefluids, there is a small amount secreted by themucous membrane lining the mouth, and all thesemingled fluids const
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