Sensory neurons in the colon (IMAGE) Harvard Medical School Caption An image of the colon wall showing different types of sensory neurons labeled with fluorescent dyes. Neurons that signal from the colon to the brain (green) become active in response to stretching and pain, with different types responding to different intensities of stimuli. Credit Rachel Wolfson Usage Restrictions none License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.