未成熟上颚门牙
immature permanent incisor
单一上门牙
solitary maxillary central incisor
上颚侧切齿先天缺失
congenital missing of maxillary lateral incisors
中侧门门锁装置
center side door lock device
臂侧上平屈
arms sideward with fingers on shoulders
臂侧上直屈
arms sideward with forearms upward
arms forward with forearms upward
臂外侧上皮神经
superior lateral brachial cutaneous nerves
臂外侧上皮神经营养血管
superior lateral arm cutaneous neural vessels