The image describes each part of a neuron and its functionalities. In general, each component has a different function, starting from the Cell body, Dendrites, Axon, Action Potential, Myelin sheath, and Terminal button.
This figure depicts the components of a neuron and demonstrates how it is work. It is clear from the diagram that we have the cell body on the left side of the neuron.
The lecturer discusses about the main feactures of neuron, and he divides neuron into seven parts to report. Also, he indicates the function that each part have served.