RT Book, Section A1 Panus, Peter C. A1 Jobst, Erin E. A1 Masters, Susan B. A1 Katzung, Bertram A1 Tinsley, Suzanne L. A1 Trevor, Anthony J. SR Print(0) ID 6090394 T1 Chapter 4. Introduction to Autonomic Pharmacology T2 Pharmacology for the Physical Therapist YR 2009 FD 2009 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-146043-9 LK accessphysiotherapy.mhmedical.com/content.aspx?aid=6090394 RD 2024/10/15 AB The motor (efferent) portion of the nervous system can be divided into two major subdivisions: autonomic and somatic. The autonomic nervous system (ANS) is largely autonomous (independent) in that its activities are not under direct conscious control. The ANS is concerned primarily with visceral functions that are necessary for life. The somatic system is largely concerned with consciously controlled functions such as movement and posture. Both systems have important afferent (sensory) inputs that provide sensation and modify motor output through reflex arcs of varying size and complexity.