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.