'Second brain' neurons keep colon moving

The enteric nervous system (ENS) is known as the "second brain" or the brain in the gut because it can operate independently of the brain and spinal cord, the central nervous system (CNS). It has also been called the "first brain" based on evidence suggesting that the ENS evolved before the CNS. Despite the known role of the ENS in generating motor activity in the colon, observing ENS neurons in action has been a challenge.

Nick Spencer and colleagues combined a new neuronal imaging technique with electrophysiology records of smooth muscle to reveal a pattern of activity that involves many different types of neurons firing simultaneously in repetitive bursts to activate the muscle cells at the same rate. They demonstrate how this rhythmic activity generates so-called colonic migrating motor complexes to transport fecal pellets through the mouse colon. These findings identify a previously unknown pattern of neuronal activity in the peripheral nervous system.