Mandible下颌骨 Body of mandible Superior border: alveolar arch牙槽弓 Inferior border: base of mandi|e下颌底 Outer surface: mental protuberance颏隆凸y Mental foramen颏孔 nner surface: mental spine颏棘 Digastric fossa二腹肌窝Mandible下颌骨 Body of mandible ◼ Superior border: alveolar arch 牙槽弓 ◼ Inferior border: base of mandible 下颌底 ◼ Outer surface: mental protuberance 颏隆凸 ◼ Mental foramen 颏孔 ◼ Inner surface: mental spine 颏棘 ◼ Digastric fossa 二腹肌窝