Final answer:
The adrenal medulla is closely allied with the sympathetic nervous system. It contains irregularly shaped cells that are innervated by autonomic nerve fibers.
Step-by-step explanation:
The adrenal medulla is closely allied with the sympathetic nervous system. It is an extension of the autonomic nervous system, which regulates homeostasis in the body. The adrenal medulla contains large, irregularly shaped cells that are innervated by preganglionic autonomic nerve fibers from the central nervous system.