Which of these is the medial depression of a kidney?

A) Renal sinus
B) Hilum
C) Ureter
D) Renal pelvis
E) Renal medulla

Renal Sinus

The renal sinus is a cavity within the kidney that is occupied by the renal pelvis, renal calyces, blood vessels, nerves, and fat.

Hilum

A part or structure in an organ where nerves and blood vessels enter or leave, commonly referenced in relation to the lungs or kidneys.