Autonomic outflow from the medulla is divided principally into sympathetic and parasympathetic (vagal) branches. Efferent fibers of these autonomic nerves travel to the heart and blood vessels where they modulate the activity of these target organs. The heart is innervated by vagal and sympathetic fibers.
Best Answer: The cold war didn't have a specific start or ending time but if i had to give one I'd say that it started right after WWII (1945) and ended in the early 90's, probably 1991, the fall of the Soviet Union. Source(s): xzorion54 Â· 9 years ago.
It is, however, quite safe to say that since 1947 when President Truman of the United States declared an anti-communist policy, the Cold War between the United States and the Soviet Union had begun. Throughout the 1980s, the Soviet Union fought an increasingly frustrating war in Afghanistan.