腰区的薄弱区位于() ["A．肩胛旁三角","B．肩胛下三角","C．腰上三角","D．枕下三角","E．脊肋角"] 对脊柱区脊神经后支的描述，正确的是() ["A．自椎间孔的内侧由脊神经分出，绕关节突的内侧向后行","B．至相邻横突间分为内侧支和外侧支","C．分布的节段性不如脊神经前支明显","D．手术中横断背深肌，其中的脊神经后支受损，引起肌瘫痪","E．臀区皮肤仅由骶尾神经支配"] 第6颈椎前结节的前弓有() ["A．颈总动脉","B．椎动脉","C．颈外动脉","D．颈内静脉","E．副神经"] 对颈部椎间孔的描述，不正确的是() ["A．为骨性管道","B．有脊神经和椎动脉通过","C．由相邻椎弓根的上、下切迹围成","D．其前内侧壁为椎体钩、椎间盘和椎体下部","E．后外侧壁为椎间关节"] 不属于腋窝内侧壁的结构是() ["A．胸大肌","B．前锯肌","C．肋间内肌","D．上4对肋骨","E．肋间外肌"] 项区的皮神经来自()