Density of varicosities in the CNS
| Transmitter | Location | No. of varicosities/mm3 | Reference |
|---|---|---|---|
| Noradrenergic | Hippocampus | 2.1 million | Loy et al., 1990 |
| Cortex (cerebral) | 6000 | Descarries et al., 1977 | |
| Serotonergic | Cerebellar cortex | 0.24 million | Beaudet and Sotelo, 1981 |
| Cerebellar cortex (agranular) | 2 million | Beaudet and Sotelo, 1981 |