Zona incerta

The zona incerta is a small region of gray matter that is part of the subthalamus.

Anatomy
This nucleus is located  medially to the internal capsule, ventral to the thalamus, and is contiguous with the Thalamic reticular nucleus.

This nucleus separates the lenticular fasciculus from the thalamic fasciculus.

Function
This region receives widespread input from the cerebral cortex and cerebellum, and sends outputs back to the cortex.

Its functions, however, remain largely unknown.