目的：探讨颌下切口手术下颌缘支损伤的原因及预防方法。
Objective: To investigate the causes and preventive measures of injuring submandibular branch of facial nerve in operation with submandibular incision.
长有颌缘牙的、端生齿的动物。
Having teeth attached to the edge of the jawbone without sockets.
结论采用分段定位的方法能更准确显示面神经下颌缘支的位置，以满足颌面部外科手术的需要。
ConclusionPositioning section by section could better and trulier throw out the location of the marginal mandibular branch of the facial nerve according to the requirement of maxillofacial surgery.
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