About the structure of kidney, which of the following descriptions are correct?
选项：

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 calyx.
E:The renal pelvis (肾盂) becomes narrow and then form the ureter.