Axonal branching patterns of nigrostriatal cells at striatal and extrastriatal levels
| Nigral sector, number of labeled axons (n), and cell type | Axonal branching: sites and degree1-a | ||||
|---|---|---|---|---|---|
| CPu | FStr | Extrastriatal structures | |||
| M | S | SS | |||
| Dorsal tier (n = 19) | |||||
| Type 1 (n = 12) | ++/+++ | −/+ | −/+ | − | −/+ |
| Type 2 (n = 3) | ++/+++ | ++/+++ | −/+ | − | +/++ |
| Type 3 (n= 4) | − | − | −/+ | ++/+++ | −/+ |
| Ventral tier (n = 23) | |||||
| Outside SNr (n = 12) | −/+ | + | −/+ | − | −/+ |
| Within SNr (n = 7) | + | ++/+++ | − | − | +/++ |
| Cell clusters (n= 4) | |||||
| 1 | +++ | − | + | − | ++ |
| 2 | + | − | + | − | +++ |
| 3 | − | − | + | − | +++ |
| 4 | − | + | − | − | +++ |
CPu, Caudate-putamen; FStr, fundus striati; M, striatal matrix compartment; S, striosome; SS, subcallosal streak.
↵F1-a Degrees of axonal branching: −, none; +, weak; ++, moderate; +++, high.