Inferior branches (inferior suprarenal arteries) from the renal arteries pass upward to the suprarenal glands.
In contrast to this multiple arterial supply is the venous drainage, which usually consists of a single vein leaving the hilum of each gland. On the right side, the right suprarenal vein is short and almost immediately enters the inferior vena cava, while on the left side, the left suprarenal vein passes inferiorly to enter the left renal vein.