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Show DIS‘LOCATIUN OF THE LOWER IAVV'a DISLOCATION or run 03 nrornns. 182‘ In reducing the dislocation of the lower jaw we must pro‘vide a protection to the thumbs, by wrapping a bit of linen round them, or by wearing a strong glove. The patient is seated low, and his head is held firmly by an assistant. The surgeon puts his thumbs deep into the mouth, so that they rest upon the grinding teeth, the fingers grasp the chin and base of the jaw. The back part of the jaw is to be forced downward by the strength of the thumbs, while the chin is lifted by the palm and fingers. By this exertion the surgeon endeavours to carry the condyle under the level of the root of the zygomatic process ; which stands an eminence before the articulating surface of the temporal bone; which protected the jaw from dislocation when in its natural situation -, and which mum DISLOCATION 01" THE LOXVEI'. JAVV. i on the 1r when the mouth is open a man receives a blow in this chin, the jaw may be dislocated. The jaw being es becom jaw the of angle case dropt to its utmost limit, the loui condy the the fulchrum, and the blow on the chin forces w of process forward from its seat in the articulating hollo atio zygom the of root the the temporal bone ; it starts over . process. One or both condyles may be dislocated. 18 The marks of the dislocation are these :--1. The mouth the ng putti On 2. . spond open, and the teeth do not corre ear, finger on the root of the zygomatic process before the if the bone and making the patient attempt to move the jaw, of the connence promi be in its place we ought to feel the there IS place dyle of the jaw; but if dislocation has taken lower a hollow before the ear. The coronoid process of the atdisloc is bone the when cheek jaw is felt prominent in the Kt. ted. distor is ed. 3. The jaw is protruded forward, or are ition Saliva flows from the mouth ; the speech and deglut somewhat impeded. by the deWhen one condyle only is dislocated it is known and by the pression being felt before the ear of one side only, lateral position of the chin, z. t o ‘3 .m- ".-77'?"‘ "'5' "flaw: :--» u g raven-It flj‘ -Vwaat_ra~f..r‘s. ,- '0‘", ,4 ‘_ 350 w. "4 now prevents its reduction. As soon as the condyles of the lower jaw are freed from the eminence of the temporal bone, the muscles of the jaw draw them into their places, and sometimes with so much spasmodic force as to close the teeth and bruise the surgeon's thumbs ; to avoid which, he slips them 011‘ the grinding teeth upon the gums and check. If the surgeon does not succeed in reducing the jaw by attempting to push both condyles into their place at once, he then attempts to reduce first one side, and then the other. To preserve the jaw in its place it is only necessary to put some check upon the opening of the jaw further than is necessary to eating and speaking. DISLOCATION OF THE HORN OF THE 03 IIYOIDIJS- THE dislocation of the horn of the os hyoides is a consequence of swallowing a large morsel. The nature of this case was discovered by Valsalva. It is attended with a sad den difficulty of swallowing, with an uneasy sensation which excites the muscles of deglutition into frequent action. There is a painful prominence of the bone, to the feeling like a tu~ mour on the throat. I have not seen this kind of dislocation. The manner of replacing it is by pressing and molding the parts on the out- ‘. -: ;-2 WW!" \v is,» |