توده سیاه

Section through superior colliculus showing Substantia nigra.

Coronal slices of human brain showing the عقده‌های قاعده‌ای، globus pallidus: external segment (GPe), subthalamic nucleus (STN), globus pallidus: internal segment (GPi), and substantia nigra (SN, red). The right section is the deeper one, closer to the back of the head.