subthalamic fasciculus subthalamic fasciculus the subthalamic fasciculus is a bi-directional neural tract that connects the subthalamic nucleus and the globus pallidus. subthalamic fasciculusda-loops in parkinson's disease (subthalamic fasciculus visible but not labeled.)detailsidentifierslatinfasciculus subthalamicusneuronames2280ta98a14.1.08.677 a14.1.09.522ta25755fma77525anatomical terms of neuroanatomy