RT Book, Section A1 Ropper, Allan H. A1 Samuels, Martin A. A1 Klein, Joshua P. SR Print(0) ID 57618668 T1 Chapter 27. The Hypothalamus and Neuroendocrine Disorders T2 Adams and Victor's Principles of Neurology, 10e YR 2014 FD 2014 PB The McGraw-Hill Companies PP New York, NY SN 978-0071794794 LK accessmedicine.mhmedical.com/content.aspx?aid=57618668 RD 2021/01/16 AB The hypothalamus plays three roles in the actions of the nervous system. The first, as the "head ganglion" of the autonomic nervous system, was described in the preceding chapter; the second, as the circadian and seasonal clock for behavioral and sleep–wake functions, was considered in Chap. 19 on sleep; and the third, as the neural center of the endocrine system, is the subject of this chapter. In the hypothalamus, these systems are integrated with one another as well as with neocortical, limbic, and spinal influences. Together, they maintain homeostasis and participate in the substructure of emotion and affective behavior.