What is "hilum"?

The hilum is a specific anatomical location on an organ where blood vessels, nerves, and other important structures enter or exit. It serves as a gateway for the organ's vascular supply, lymphatic drainage, and innervation. The hilum typically appears as a depression or slit-like opening, allowing for the efficient transport of essential substances and communication between the organ and the surrounding tissues. The structures that pass through the hilum play a crucial role in maintaining the organ's functionality and connectivity within the body.