Efferent connections of the internal globus pallidus in the squirrel monkey: II. topography and synaptic organization of pallidal efferents to the pedunculopontine nucleus

The first objective of the present study was to verify whether projections from regions of the internal pallidum (GPi) that receive inputs from different functional areas of the striatum remain segregated at the level of the pedunculopontine nucleus (PPN) in squirrel monkeys. Second, we analyzed the ultrastructural features and synaptic organization of pallidal terminals in contact with PPN neurons. This was achieved by performing iontophoretic injections of biotinylated dextran amine (BDA) in different regions of the GPi.

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