An interneuron (also called internuncial neuron, relay neuron, association neuron, connector neuron, intermediate neuron or local circuit neuron) is a broad class of neurons found in the human body.  Interneurons create neural circuits, enabling communication between sensory or motor neurons and the central nervous system (CNS).
A neuron or nerve cell is the fundamental unit of signal processing; an electrically excitable cell that processes and transmits information through electrical and chemical signals. Dendrites are like antenna which receive information and pass it to cell body. Cell body is a processor/integrator ...
It may either carry information to brain (sensory) or from brain (motor) or mixed. Nerve consist of below structures. Nerve tissue consist of neurons and glial cells (they are supporting cells and has numerous roles including house keeping, protection, and lot more). Glial cells are unsung heroes and batman of nervous system.
The other two neurons are known as relay neurons and motor neurons. Relay neurons carry messages from on segment of the central nervous system to another while motor neurons carry signals from the central nervous system to effectors, which is an organ that has a particular effect when it is stimulated. The message that is relayed throughout this process is commonly known as an impulse, and it is sent along neuron pathways via electrical charges that move across the neural cell membrane.