Monday, May 18, 2009

Globus Pallidus

The globus pallidus is a major constituent of the basal ganglia core, which is a subcortical structure of the brain. The globus pallidus is divided into two segments by the medial medullary lamina: internal globus pallidus, and external globus pallidus, which are surrounded everywhere by myelinic walls. Both receive input from the caudate nucleus and putamen, and both are in communication with the subthalamic nucleus.

The globus pallidus, like the rest of the basal ganglia, is grey matter, but a light grey, made up neurons bodies and is surrounded by white matter. The globus pallidus is traversed by the numerous myelinated axons of the striato-pallidonigral bundle that give it the pale appearance from which it is named. The globus pallidus is one of three nuclei that make up the basal ganglia and is involved in the regulation of voluntary movements at a subconscious level.