which cells transmit messages between the brain and other part of the body 

Dear student, 1) Neurons ( nerve cells) transmit messages between brain and other parts of the body. Neuron is the basic functional and structural unit of nervous system. They're designed to transmit the messages throughout the body. They are branched and elongated. 2) Structure of neuron - A neuron has three main parts. The cell body directs all activities of the neuron. Dendrites extend out from the cell body and receive messages from other nerve cells. An axon is a long single fiber that transmits messages . HOPE THIS HELPS. REGARDS!!