Applied anatomy and oral surgery for dental students . n depressing the man-dible become more and more active in their work in anendeavor to overcome the fixation of the temporo-mandibular articulation. By their action the lower jaw,from the symphysis to the angle, becomes modified inproportion to the contraction of the depressing musclesof the lower jaw. Anteriorly, there are the geniohyo-glossus, the sternohyoid, the sternothyroid, the digastric,the omohyoid, and the platysma myoides, all of whichare abnormally active. Their action without the com-pensating factor of the mandibular motion br
Applied anatomy and oral surgery for dental students . n depressing the man-dible become more and more active in their work in anendeavor to overcome the fixation of the temporo-mandibular articulation. By their action the lower jaw,from the symphysis to the angle, becomes modified inproportion to the contraction of the depressing musclesof the lower jaw. Anteriorly, there are the geniohyo-glossus, the sternohyoid, the sternothyroid, the digastric,the omohyoid, and the platysma myoides, all of whichare abnormally active. Their action without the com-pensating factor of the mandibular motion brings aboutthe changes noted ^ (Figs. 50 and 51). {h) False ankylosis is partial immobility, due to changes Cryer, Studies in the Internal Anatomy of the Face. THE TEMPOROMAXDIBULAR ARTICULATIOy 219 in structures outside the joint. It may be—(i) chronic,(2) acute. Chronic false ankylosis of the temporomandibularjoint may be due to (a) trauma, resulting in thickeningof the ligaments, or formation of scar tissue from awound in the region of the Fig. so.—.\rikyi(^.^i.^ o( jaw (allcr L rycry (b) Inflammatory conditions, followed by organiza-tion of exudate or formation of scar tissue about thejoint. ic) Cicatricial tissue following sloughing within themouth in the course of acute exanthemata (scarlet fever,etc.). 220 SPECIAL SURGERY The changes in the shape of the mandible followingprolonged ankylosis of this character are similar tothose seen in acute ankylosis.
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