Summary of the data from the studies of the pattern of synaptic distribution
| Human TEC | Striate cortex (area 17) of the monkey1 | Visual cortex of the adult cat2 | Somatosensory cortex of the adult rat (P60)3 | |||
|---|---|---|---|---|---|---|
| Layer II | Layer II−III | All layers | Layer II | All layers | All layers | |
| AS on spines | 55.2% | 54.9% | 53.0% | 71.2% | 66.4% | 73.0% |
| AS on dendritic shafts | 37.4% | 27.7% | 30.0% | 13.3% | 17.6% | 12.9% |
| SS on dendritic shafts | 6.7% | 11.4% | 11.9% | 10.8% | 10.6% | 9.3% |
| SS on spines | 0.61% | 6.0% | 5.1% | 4.7% | 5.3% | 4.8% |
Data are given as percentages. Data were taken from: 1Beaulieu et al., 1992; 2Beaulieu and Colonnier (1985); 3Micheva and Beaulieu (1996).