Neurones are nerve cells, two main types are sensory and motor neurones; relay neurones (interneurons only in CNS with many short dendrites and single short axon) are important in reflex actions
Reflex Arc: How neurones are organised; automatic, innate, protect from harm, it is neurone sequence rapidly transmitting impulses to cause a reflex response;
Nerve is an axon bundle surrounded by connective tissue covering, it is similar to an electrical cable with lots of electrical wires in it
Sensory nerve contains only sensory neurone axons, motor nerve contains only motor neurone axons and a mixed nerve contains both sensory and motor axons
