The medial facing wall of the mandibular foramen was found to be the commonest dedicated sites (99.3%), followed by foramina on either of the genial ttubercles (72.8%), the median foramen above the genial tubercles (68.9%) and the digastric fossa (66.2%).

• 在下颌孔的内侧面副孔的出现率最高 (99.；3%25 )；其次为两侧的颏结节 (72