多项选择题
A． at the internal urethral orifice B．at the external orifice of urethra C．at the membranous part D．at prostatic part E．at bulb of urethra
A．common carotid a. and its branches B．internal jugular v. and its tributaries C．hypoglossal n. D．vagus nerve E．accessory nerve
A．renal column B．renal pyramid C．renal cortex D．minor renal calices E．major renal calices