Neurone or nerve cell is classified into three types which are sensory neurone (afferent neurone), relay neurone (interneurone) and motor neurone (efferent neurone).
Sensory neurone / Afferent neurone
Sensory neurone also known as afferent neurone, transmits nerve impulses from receptor to central nervous system (CNS) which consists of brain and spinal cord.
Relay neurone / Interneurone
Relay neurone also known as interneurone, transmits nerve impulses from sensory neurone to motor neurone. Relay neurone is found within the central nervous system (CNS).
Motor neurone / Efferent neurone
Motor neurone also known as efferent neurone, transmits nerve impulses from central nervous system (CNS) which consists of brain and spinal cord, to effectors which are either muscles or glands. In response to impulses, muscles contract and glands secrete.