笔者在制作一成年男性下颌骨标本时,发现该标本下颌神经管骨内穿行支变异1例,现报道如下。该标本双侧下颌升支内侧面中份有薄而小的下颌小舌,下颌小舌内侧面可见下颌孔,下颌神经管自下颌孔始走行于下颌骨内,于双侧第二前磨牙下方出颏孔。右侧下颌升支前缘可见一孔洞,孔直径0.8mm,孔周有线形切迹(图1)。插入直径0.5 mm正畸 The author in the production of an adult male mandibular specimens, found that the specimens of mandibular neural tube perforation of the branch of a variant, are reported below. The mandibular ascending medial branch of the specimen has a thin and small mandibular small tongue, the mandibular small tongue medial face can be seen under the mandibular foramen, mandibular neural tube from the mandibular foramen go in the mandible, in the bilateral second premolar under the chin hole. The right mandibular ascending anterior margin can be seen a hole, the hole diameter 0.8mm, the hole around the linear notch (Figure 1). Insert 0.5 mm in diameter orthodontic