Frequency of filopodia, perforated spines, spinules, stubby spines, and branched spines in different brain regions
| Brain region | Filopodia (%) | Perforated spines (%) | Spinules (%) | Stubby spines (%) | Branched spines (%) | Number of spines in branches (range) |
|---|---|---|---|---|---|---|
| CA1 PSR | 1.78 | 2.72 | 3.26 | 2.90 | 7.97 | 2 |
| CA1 SLM | 0.00 | 50.00 | 8.57 | 1.43 | 0.00 | – – |
| Cortex | 3.07 | 8.60 | 0.90 | 2.26 | 9.50 | 2–4 |
| Striatum | 5.84 | 4.47 | 4.71 | 0.00 | 13.40 | 2–3 |
| CB | 4.19 | 0.00 | 0.61 | 0.00 | 12.62 | 2–5 |
Filopodia lack synaptic contacts with the presynaptic terminals.