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
The adjective form is "hilar", and the plural is "hila".
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