Editing Adrenal gland (section)

===Blood supply===
The adrenal glands have one of the greatest blood supply rates per gram of tissue of any organ: up to 60 [[arteriole|small arteries]] may enter each gland.<ref name="isbn960-399-074-4">{{cite book |vauthors=Mirilas P, Skandalakis JE, Colborn GL, Weidman TA, Foster RS, Kingsnorth A, Skandalakis LJ, Skandalakis PN |title=Surgical Anatomy: The Embryologic And Anatomic Basis Of Modern Surgery |publisher=McGraw-Hill Professional Publishing |year=2004 |isbn=978-960-399-074-1 }}</ref> Three arteries usually supply each adrenal gland:<ref name=Thomas2013 />
* The [[superior suprarenal artery]], a branch of the [[inferior phrenic arteries|inferior phrenic artery]]
* The [[middle suprarenal artery]], a direct branch of the [[abdominal aorta]]
* The [[inferior suprarenal artery]], a branch of the [[renal artery]]
These blood vessels supply a network of small arteries within the capsule of the adrenal glands. Thin strands of the capsule enter the glands, carrying blood to them.<ref name=Thomas2013 />

[[Vein|Venous blood]] is drained from the glands by the [[suprarenal veins]], usually one for each gland:<ref name=Thomas2013 />
* The [[right suprarenal vein]] drains into the [[inferior vena cava]].
* The [[left suprarenal vein]] drains into the left [[renal vein]] or the left [[inferior phrenic vein]].

The central adrenomedullary vein, in the adrenal medulla, is an unusual type of blood vessel. Its structure is different from the other veins in that the [[smooth muscle]] in its [[tunica media]] (the middle layer of the vessel) is arranged in conspicuous, longitudinally oriented bundles.<ref name=ross />