RT Book, Section A1 Kandel, Eric R. A1 Koester, John D. A1 Mack, Sarah H. A1 Siegelbaum, Steven A. SR Print(0) ID 1180644346 T1 The Brain Stem T2 Principles of Neural Science, 6e YR 2021 FD 2021 PB McGraw Hill PP New York, NY SN 9781259642234 LK neurology.mhmedical.com/content.aspx?aid=1180644346 RD 2024/03/28 AB IN PRIMITIVE VERTEBRATES—REPTILES, amphibians, and fish—the forebrain is only a small part of the brain and is devoted mainly to olfactory processing and to the integration of autonomic and endocrine function with the basic behaviors necessary for survival. These basic behaviors include feeding, drinking, sexual reproduction, sleep, and emergency responses. Although we are accustomed to thinking that the forebrain orchestrates most human behaviors, many complex responses, such as feeding—the coordination of chewing, licking, and swallowing—are actually made up of relatively simple, stereotypic motor responses governed by ensembles of neurons in the brain stem.