inferior mesenteric ganglion

The inferior mesenteric ganglion is one of three major preaortic ganglia that are part of the sympathetic nervous system. These ganglia are located on the anterior surface of the aorta and distribute axons with the major gastrointestinal arteries. The inferior mesenteric ganglion specifically innervates the descending colon, sigmoid colon, rectum, urinary bladder, and sexual organs.1

The sympathetic nervous system is a division of the autonomic nervous system that regulates involuntary bodily functions. It prepares the body for action, often referred to as the "fight-or-flight response," by increasing heart rate, dilating pupils, and redirecting blood flow to muscles. This system operates through preganglionic and postganglionic neurons, with ganglia serving as collections of nerve cells outside the central nervous system.1