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Percentage distribution of synapses in the neuropil
| Layer | Asymmetric synapses (%) |
No. of synapses examined | Symmetric synapses (%) |
No. of synapses examined | ||
|---|---|---|---|---|---|---|
| Axospinous | Axodendritic | Axospinous | Axodendritic | |||
| Layer 2/3 | ||||||
| Young | 83.5±5.0 | 16.5±5.0 | 1767 | 21.5±3.9 | 78.5±3.9 | 205 |
| Old | 77.0±2.2 | 23.0±2.2 | 1197 | 28.0±6.7 | 72.0±6.7 | 157 |
| Layer 5 | ||||||
| Young | 77.8±2.6 | 23.3±2.6 | 1082 | 25.8±5.7 | 74.2±5.7 | 149 |
| Old | 75.0±4.0 | 25.0±4.0 | 922 | 23.0±6.0 | 77.0±5.7 | 124 |
