The location and numbers of pallidal boutons in synaptic contact with dendrites of neurons in the subthalamic nucleus
| Neuron number | Location and numbers of synaptic boutons (μm from cell body) | ||||
|---|---|---|---|---|---|
| 100–150 | 150–200 | 200–250 | 250–300 | 300+ | |
| 1 | 4 | ||||
| 2 | 3 | 4 | |||
| 3 | 0 | 2 | 3 | ||
| 4 | 0 | 0 | 7 | 5 | 1 |
| 5 | 4 | 1 | 4 | 3 | |
| Total | 11 | 7 | 14 | 8 | 1 |
For each neuron, a single dendrite was serially sectioned, and the number of pallidal terminals was identified on the basis of morphological features, type of synaptic specialization, and in most cases (35/41), the presence of GABA immunoreactivity. The analysis was commenced at 100 μm from the perikaryon and continued as far as the dendritic staining extended or until it left the section. For each neuron the last figure represents the maximum extent.