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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