A practical and systematic treatise on fractures and dislocations . f the articular eminences, the jaw is spas-modically forced forward by the combined action of the mas-seters and internal pterygoid muscles. A backward dislocation is impossible unless the osseousstructure of the external ear is broken at the same time. Dis-location of one condyle forward, the other being left in place,is an accident of not extremely rare occurrence; though bothcondyles are much more frequently luxated in one injur3^ The symptoms of dislocated jaw are so marked and charac-teristic, that, says Robert Wm. Smith,
A practical and systematic treatise on fractures and dislocations . f the articular eminences, the jaw is spas-modically forced forward by the combined action of the mas-seters and internal pterygoid muscles. A backward dislocation is impossible unless the osseousstructure of the external ear is broken at the same time. Dis-location of one condyle forward, the other being left in place,is an accident of not extremely rare occurrence; though bothcondyles are much more frequently luxated in one injur3^ The symptoms of dislocated jaw are so marked and charac-teristic, that, says Robert Wm. Smith, were there not re-corded cases to the contrary-, we could scarcely suppose itpossible that the true nature of the accident could be over-looked. ^ * The mouth remains widely opened, and the indi-vidual is unable to close it; the incisor teeth of the lower pro-ject beyond those of the upper jaw; the saliva flows fromthe mouth involuntarily and profusely; speech is difficult,and the pronunciation of labial consonants impossible ; deglu- 292 Dislocations. Fia. tition can not be performed, and the motions of the tongueare limited. The masseteric regions of the cheeks are flattened, a de-pression is observed in front of the auditory canal, immedi-ately below the horizontal root of the zygoma, and the lingercan be sunk into the parotid space. The coronoid processforms below the malar bone, a prominence which is very visibleexternally, but which is most distinctlyfelt through the mouth. There is likewise an evident fullnessin the temporal fossa, between the eye-brow and the ear, immediately abovethe zygoma. This prominence (whichdoes not seem to have been noticed byany writer except Mr. Adams) appearsto be thus produced: As soon as thecondyle has cleared the articular emin-ence, it at once becomes placed upon aTtlSe^prXcerbyra:- higher level than the apex of the coro-locahoa of the interior max- noid proccss; it is clevatcd in the same proportion as the coronoid process isdepre
Size: 1381px × 1809px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectfractur, bookyear1870
