The document summarizes the development of the autonomic nervous system (ANS) which has two main divisions - the sympathetic and parasympathetic nervous systems. It describes the migration of neural crest cells to form the sympathetic ganglia along the spinal cord and around the aorta. It also discusses the formation of preganglionic and postganglionic fibers in both the sympathetic and parasympathetic systems. Additionally, it provides an overview of the development of the adrenal cortex and medulla from mesodermal and ectodermal tissues, respectively.