下颌角骨折，前骨折段因哪个肌肉的牵拉而向下内移位A.咬肌 B.降颌肌群 C.翼内肌 D.颊肌 E. 二腹肌

作者: tihaiku 人气: - 评论: 0

问题下颌角骨折，前骨折段因哪个肌肉的牵拉而向下内移位

选项 A.咬肌 B.降颌肌群 C.翼内肌 D.颊肌 E. 二腹肌

答案 B

解析下颌角部骨折：骨折线正位于下颌角时，且两个骨折段上都有咬肌与翼内肌附着，骨折段可不发生移位；如骨折线位于这些肌肉附着处之前，前骨折段因降颌肌群的牵拉而向下内移位，而后骨折段则因升颌肌群的牵引而向上前移位。

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