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 . pper jaw, and supplies the cheek,the upper lip, and the outside of the nose; whilethe third comes out at a point near the front of thelower jaw, and supplies the chin and lower lip, be-sides having sent branches to the teeth and tongue,before emerging fromthe jawbone. Thesenerves are the greatnerves of sensation ofthe face, and are g
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 . pper jaw, and supplies the cheek,the upper lip, and the outside of the nose; whilethe third comes out at a point near the front of thelower jaw, and supplies the chin and lower lip, be-sides having sent branches to the teeth and tongue,before emerging fromthe jawbone. Thesenerves are the greatnerves of sensation ofthe face, and are gener-ally considered to bethe most exquisitelysensitive nerves in thewhole body. They areoften the seat of neu-ralgia, and give rise tothe most intense andintolerable suffering. The facial nerve(Fig. 6i) is the motornerve of the face; itemerges from the skull just below the ear, and, passing forward throughthe parotid gland, is distributed to all the musclesof the face. Paralysis of this nerve is far from un-common, and produces a most singular and charac-teristic effect upon the countenance. Exactly onehalf of the face loses all expression, as much as ifdead, and the contraction of the muscles of the op-posite side, not being in any way counteracted, pro-. FiG. 6i.—Diagram showing the distri-bution of the facial nerve to the face. SPECIAL NERVES.—HYGIENE. 233 duces dreadful, though often ludicrous, distortionof the features. This form of paralysis often occursamong hackmen and others who are exposed tostormy weather. If a strong wind, particularlywhen accompanied by snow or sleet, be allowed tobeat upon the side of the face, there is great dangerof paralysis of the facial nerve. Such exposure ofthe place where this nerve emerges from the skullshould be carefully avoided. 296. The Sciatic Nerve.—Each limb of the bodyis supplied by large nerve-trunks, which, as a rule,follow very nearly the course of the arteries. Thelargest nerve of the leg, however, runs down be-hind the
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