Editing Adrenals (section)

=== Arterial Supply ===
* '''<span style="color:#ff0000">Sources (3):'''
*# '''<span style="color:#ff0000">Superior adrenal artery, typically arises from the inferior phrenic artery</span>''', and rarely from the aorta, celiac axis, or intercostal arteries.
*# '''<span style="color:#ff0000">Middle adrenal artery, typically arises from the lateral aspect of the aorta</span>''' and rarely from the inferior phrenic artery or renal artery.
*# '''<span style="color:#ff0000">Inferior adrenal artery typically arises from the</span>''' superior aspect of the '''<span style="color:#ff0000">ipsilateral renal artery'''
** '''The superior arterial supply from the phrenic artery is constant; the middle and inferior arteries are variable'''
* '''Blood distribution within the adrenal gland'''
** '''Capsular arteries supply only the adrenal capsule and do not penetrate more deeply into the tissue.'''
** '''The medulla has two blood supplies'''
**# '''Arterial blood from the medullary arterioles'''
**## Medullary arterioles travel within the trabeculae of the adrenal gland to deliver blood to the medullary capillary sinusoids.
**# '''Venous blood from the cortical sinusoid capillaries that have already supplied the adrenal cortex with arterial blood'''
**#* Fenestrated cortical sinusoidal capillaries supply the cortex and then drain into fenestrated medullary capillary sinusoids.
*** '''This dual vascular supply is important for the medullary production of catecholamines'''
**** '''As venous blood from the adrenal cortex reaches the medullary tissue, it contains a high concentration of glucocorticoids, and this situation plays a role in epinephrine synthesis'''