Subthalamic Nucleus (STN)

A small, lens-shaped nucleus in the subthalamus, playing a crucial role in the basal ganglia circuit, particularly in the indirect pathway that inhibits unwanted movements.

Key Functions:

• Excites the globus pallidus pars interna (GPi), inhibiting unwanted movements.
• Key component of the indirect pathway of the basal ganglia.
• Target for deep brain stimulation in Parkinson's disease.

Interacting Systems & Components:

• Subthalamus (located within)
• Basal Ganglia (integral to its function)
• Globus Pallidus (projects to and receives input from)
• Substantia Nigra (interacts with)
• Parkinson's Disease (implicated in)