Fig. 8.
Synaptic convergence of terminals derived from different functional domains of the pallidal complex in the subthalamic nucleus. A, Cell body of a neuron in the subthalamic nucleus (STNn) that is postsynaptic to two anterogradely labeled boutons. The bouton bVP, shown at high magnification in B, contains the crystalline BDHC reaction product that occupies only part of the bouton. The BDHC was used to reveal the PHA-L transported from the ventral pallidum. The bouton forms symmetrical synaptic contact (arrow) with the neuron. The bouton bGP, shown at higher magnification in C, is intensely labeled with the floccular DAB reaction product used to localize the BDA transported from the globus pallidus. The reaction product fills the whole of the bouton and obscures most internal structures. This bouton forms symmetrical synaptic contact with the neuron (arrow). Scale bars: A, 3 μm; B, C (shown inC), 1 μm.