Basal ganglia and amygdala
1. Globus pallidus internus
Globus pallidus internus is one of the two parts of the globus pallidus, the other part is globus pallidus externus. Both globus pallidus internus and globus pallidus externus are components of the basal ganglia and receive similar input, but they have very different output. Whereas both globus pallidus internus and globus pallidus externus receive input from the striatum, only globus pallidus internus is a major source of output from the basal ganglia.
- 1.Globus pallidus internus
- 2.Globus pallidus externus
- 4.Caudate nucleus
- 5.Internal capsule
- 8.Ansa lenticularis
- 9.Corpus callosum
- 10.Corona radiata
- 11.Cingulate gyrus
- 14.Fornix (plural fornices)
In this view we see:
- The coronal section of the brain showing the deep basal ganglia and amygdala, which are not visible in the mid-sagittal view in Image 2.
- The corpus callosum crossing between the two hemispheres. The corpus callosum and other structures seen in Image 2 appear very different here.
- Three components of the basal ganglia: caudate nucleus, putamen and globus pallidus. The basal ganglia are a group of nuclei situated deep within each cerebral hemisphere and consist of the caudate nucleus, putamen, globus pallidus, subthalamic nucleus (seen in Image 6) and substantia nigra (seen in Image 10). Note that:
- the caudate nucleus and putamen are separated from each other by the internal capsule, which also separates the globus pallidus from the thalamus;
- the left and right amygdalae are visible inferior to the globus pallidus and internal capsules on each side of the brain;
- the amygdala, like the thalamus, is not part of the basal ganglia.