Final answer:
The anteromedial border of the spleen contains the hilum and is the site where the splenic artery enters, paralleling kidney anatomy where the renal artery enters at the hilum.
Step-by-step explanation:
The anteromedial border of the spleen contains the hilum. This is the part of the spleen where structures such as blood vessels and lymphatic vessels enter or leave the organ. Specifically, the splenic artery enters the spleen at the hilum. The spleen, being similar to a lymph node, filters blood and consists of both red and white pulp — with red pulp serving as a storage and filtration medium for blood and the removal of damaged red blood cells, and white pulp rich in lymphocytes that remove antigen-coated bacteria from the blood.
Comparatively, the spleen is attached to the lateral border of the stomach via the gastrosplenic ligament and filters blood, whereas the kidneys, which have a convex and concave side, have a hilum on the concave side where the renal artery enters, and the renal vein and ureter leave. The hilum of the spleen is similarly the site of entry for the splenic artery and exit for the splenic vein, which parallels kidney anatomy and function to some degree.