subthalamic nucleus
A small lens-shaped nucleus in the brain, part of the basal ganglia, involved in motor control. Used in medical and neuroscience contexts.
The subthalamic nucleus plays an important role in motor regulation.
視床 (thalamus) is a larger structure above the subthalamic nucleus; 視床下核 is located below it.
淡蒼球 (globus pallidus) is another basal ganglia nucleus that interacts closely with the subthalamic nucleus.
Compound of 視床 (thalamus) + 下 (below) + 核 (nucleus), literally 'nucleus below the thalamus'. A modern anatomical term.