F waves (motor): assess the entire length of a motor axon 

-good for evaluating proximal neuronal function

-Assessed with supramaximal electrical stimulation which travels antidromically to motor neuron cell bodies and then back down orthodromically back toward muscle

 H-reflex (Sensory to motor): sends an electrical stimulus via sensory afferents orthodromically to the spinal cord which then synapses on motor neurons. These motor neurons then send an efferent action potential orthodromically down towards muscle