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The concave surface of the lungs where blood vessels, lymphatic vessels, nerves and the primary bronchi enter and leave contains a slit called the HILUM. It is also known as the root region.
The hilum (root region) is the point at which bronchi, pulmonary arteries and pulmonary veins enter into the lung.
Each hilum (left and right) has a pulmonary artery, pulmonary veins, and bronchial arteries.
The hilum or root region connects the lungs to supporting structures where pulmonary vessels enter and exit the lungs.
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