. Injuries and diseases of the jaws . fragment projected inwards and slightly upwardsinto the cavity of the mouth. The large fragment rode thesmall one, having retreated downwards and backwards, and 10 FRACTURE OF THE LOWER JAW. its extremity, which was somewhat pointed, could be feltexternally under the integument/^ In double fractures of the body of the jaw, one being oneach side of the median line, the displacement is necessarilygreater, since the muscles attached to the chin tend to drawthe central loose piece downwards and backwards towardsthe hyoid bone, whilst both lateral portions are
. Injuries and diseases of the jaws . fragment projected inwards and slightly upwardsinto the cavity of the mouth. The large fragment rode thesmall one, having retreated downwards and backwards, and 10 FRACTURE OF THE LOWER JAW. its extremity, which was somewhat pointed, could be feltexternally under the integument/^ In double fractures of the body of the jaw, one being oneach side of the median line, the displacement is necessarilygreater, since the muscles attached to the chin tend to drawthe central loose piece downwards and backwards towardsthe hyoid bone, whilst both lateral portions are drawn for-wards and outwards, as described in the previous , as is probably the case in most instances of thekind, the obliquity of the fracture is the same on the twosides—, at the expense of the outer surface of both ex-tremities of the central fragment, no difficulty is experiencedin reducing the fracture, and it is only necessary to see thatthe posterior fragments are sufficiently approximated to it; Fig. but when, as in specimen 2 of Kings College, the obliquityis different on the two sides, the fracture being at the ex-pense of the outer plate of the posterior fragments on theright side, and the reverse on the left side (consequent nodoubt upon the blow having been struck to the left of themedian line), it is obvious that great difficulties will beencountered both in reducing and maintaining the apposi-tion of the fragments, as indeed was the case with thepatient in question. Malgaigne records an almost similar casein which reduc-tion could not be cifectcd. The middle fragment, whichwas strongly drawn downMard and backward, was easily DOUBLE FRACTURE OF THE JAW. 11 brought forward nearly to a level with the other two, butwhen it came close to that on the right side it seemed tocatch against its posterior surface, as is seen in the figure(fig. 2), and no effort could disengage it. On post-mortemexamination the right fragment in its upper half was b
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