Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Schematic model of the cortico-striatal-thalamic-cortical (formerly extrapyramidal) circuits, including the indirect and direct pathways; ENK, enkephalin; GPe, Globus pallidus, external segment; GPi, Globus pallidus, internal segment; SNc, Substantia nigra, pars compacta; SNr, substantia nigra, pars reticulata; SP/DYN, substance P/dynorphin; STh, subthalamic nucleus; D1, D2, medium-sized spiny neurons with D1 or D2 receptors.
