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Cut transversely through a suprarenal gland and examine its internal structure. The inner medullary region of the suprarenal gland is grayish in color and is the site of the production of the catecholamines. The outer cortical region is yellowish in color and is the site of the production of the steroid hormones.

Links and References:
Grant's: 2.85, 2.108
Netter (1ed.): 315, 328 (2ed.): 311, 324
Rohen/Yokochi: 304, 311