Here's the region of the hilus , the depression on the surface of the node that marks the places of entry and exit of blood vessels, and the point of exit of lymphatic vessels.
Venous blood leaves at the hilus.
The lymph which has been oozing through the node, meanwhile, has been collected into larger and larger spaces as it moves through the medulla, eventually being brought to the exit point in a large efferent lymphatic vessel . Notice the arrangement of the tissue in the medulla compared to the cortex. Instead of being packed in as tightly as possible, the lymphocytes are arranged into anastomosing cords with less dense sinuses between them. At somewhat higher magnification the large efferent vessel at the hilus is easier to define.