The nervous system is the part of an animal 's body that coordinates its voluntary and involuntary actions and transmits signals to and from different parts of its body.Nervous tissue first arose in wormlike organisms about 550 to 600 million years ago.he size of the nervous system ranges from a few hundred cells in the simplest worms, to around 100 billion cells in humans. The central nervous system functions to send signals from one cell to others, or from one part of the body to others and to receive feedback.
Leslie, Missouri. Leslie is a village in Franklin County, Missouri, United States. The population was 171 at the 2010 census.
County History. St. Charles County is located in the state of Missouri just northwest of St Louis. Its county seat is St Charles. The county has a total area of 592; miles. 560 miles is land and 32 miles is water. By 1760, French traders, trappers and missionaries had penetrated the Mississippi River Valley and established settlements as far south as the Missouri River in St. Charles County.