What is the function of the external globus pallidus?

The external globus pallidus plays a crucial role in the basal ganglia circuitry, specifically within the indirect motor pathway. Its primary function is to serve as an inhibitory nucleus. In the context of motor control, it processes inputs from the striatum and modulates output to other basal ganglia structures, which in turn influences the thalamus.

This pathway helps inhibit unwanted movements and facilitates a smooth execution of voluntary motions. By providing this inhibition, the external globus pallidus contributes to the fine-tuning of motor commands, ensuring that the appropriate movements are executed while suppressing others. In summary, its role within the indirect pathway of the basal ganglia is essential for the proper regulation of motor activities, promoting efficiency and coordination in movement.