Final answer:
The release of adrenal medullary hormones complements stimulation by preganglionic sympathetic fibers.
Step-by-step explanation:
The release of adrenal medullary hormones complements stimulation by preganglionic sympathetic fibers. These fibers originate from the sympathetic nervous system and stimulate the secretion of hormones such as epinephrine and norepinephrine from the adrenal medulla.