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The central autonomic network. Nearly all of the cell groups illustrated here are interconnected with one another, forming the central autonomic network. A. Main afferent pathways. Visceral information (solid lines) is distributed to the brain from the nucleus of the solitary tract and from ascending spinal pathways activated by the splanchnic nerves (from the gut, for example). The nucleus of the solitary tract distributes this information to preganglionic parasympathetic neurons (the dorsal motor vagal nucleus and nucleus ambiguus), to regions of the ventrolateral medulla that coordinate autonomic and respiratory reflexes, and to more rostral parts of the central autonomic network in the pons (parabrachial nucleus), midbrain (periaqueductal gray), and forebrain. The parabrachial nucleus Motor also projects to many of the more rostral components of the central autonomic network, including visceral and Source: The Autonomic System and the Hypothalamus, Principles of Neural Science, Fifth Editon gustatory nuclei of the thalamus (dashed lines). Other pathways from the spinal cord (not shown) also transmit visceral information to many parts of the Citation: Kandel ER, Schwartz JH, Jessell TM, Siegelbaum SA, Hudspeth AJ, Mack S. Principles of Neural Science, Fifth Editon; 2012 Available central autonomic network, including the nucleus of the solitary tract, parabrachial nucleus, periaqueductal gray, hypothalamus, amygdala, and cortex. The at: http://mhmedical.com/ Accessed: April 29, 2017 spinal cord also projects to the main somatosensory nucleus of the thalamus (ventral posterolateral nucleus). Copyright © 2017 McGraw-Hill Education. All rights reserved B. Main efferent pathways. All of the pathways shown here (except perhaps for the periaqueductal gray) project directly to autonomic preganglionic