The diagram illustrates the main components of a neuron and outlines the process by which it transmits nerve impulses.
A neuron begins with the cell body (also known as the soma), which contains the nucleus and serves as the control center. Branching out from the soma are dendrites, which function to receive chemical messages from neighbouring nerve cells. Once a signal is received, it is transmitted through the axon, a long, slender fibre that passes electrical impulses away from the cell body.
The signal travelling along the axon is referred to as an action potential. This process is significantly enhanced by the presence of the myelin sheath, a fatty insulating layer that surrounds parts of the axon. The sheath increases the speed and efficiency of signal transmission. Eventually, the impulse reaches the terminal buttons at the end of the neuron. These structures form junctions, or synapses, with other neurons, muscles, or glands, enabling the signal to be transferred.
Overall, the diagram highlights how neurons are specialised for the rapid and directed communication of information throughout the nervous system.