About the structure of kidney, which of the following descriptions are correct?
A.On the coronary section, the kidney is divided into renal cortex (肾皮质) and renal medulla (肾髓质) B.The renal column (肾柱) is a part of the renal medulla. C.The tips of renal (肾锥体) pyramids form the renal papillae (肾乳头), which have papillary foramina D.Two of three minor renal calices (肾小盏) converge into one major renal calices. E.The renal pelvis (肾盂) becomes narrow and then form the ureter.正确答案ACDE
