A hilum (formerly called a hilus) is a depression or pit where structures are attached. In human anatomy, the hilum is part of an organ where structures such as blood vessels and nerves enter. The hilum of kidney (admits the renal artery, vein, ureter, and nerves) is the medial depression for blood vessels and ureter to enter the kidney chamber is the renal hilum. splenic hilum hilum of lung In botany, the hilum is a scar where the seed was attached to the ovary wall by the funiculus. The a… (More on Hilum)