sensory receptor

A sensory receptor is a cell or group of cells that can detect a stimulus in the internal or external environment of an organism and, in response, initiate the transmission of impulses via sensory neurons. Sense organs, such as the eyes, ears, nose, and skin contain large numbers of sensory receptors that are adapted to repond to different types of stimuli in the external environment. Other types of receptor are sensitive to changes of the body internal environment.