Table 3.
Ribbon synaptic contacts of OFF bipolar cell types with parasol and midget ganglion cells.
| (A) BC output | (B) MG input | ||||||
|---|---|---|---|---|---|---|---|
| Bipolar cell type | Number of axonal ribbons | Outputs of a BC to PG cells | Outputs of a BC to MG cells | Inputs from BCs to an MG cell | |||
| Mean ± SD | % | Mean ± SD | % | Mean ± SD | % | ||
| FMB | 85.0 ± 2.9 | 1.0 ± 1.4 | 1 | 66.8 ± 11.4 | 79 | 166.6 ± 20.1 | 79.7 |
| DB1 | 81.0 ± 8.5 | 12.5 ± 5.8 | 15 | 46.8 ± 1.5 | 58 | 33.7 ± 7.6 | 16.1 |
| DB2 | 132.8 ± 23.2 | 46.8 ± 13.4 | 35 | 3.8 ± 2.5 | 3 | 6.0 ± 4.0 | 2.9 |
| DB3a | 77.0 ± 7.0 | 44.8 ± 0.5 | 58 | 4.3 ± 4.0 | 10 | 1.7 ± 2.1 | 0.8 |
| DB3b | 75.8 ± 3.9 | 13.5 ± 3.5 | 18 | 1.0 ± 0.8 | 7 | 1.0 ± 1.0 | 0.5 |
| Total inputs to an MG cell by all five cell types | 209.0 ± 7.0 | 100 | |||||
(A) The ratio of outputs to axonal ribbons for each BC type is expressed in %. n = 4 for the number of bipolar cells, (B) Partial contributions of different BC types to MG input are expressed in %. n = 3 for the number of MG cells.
BC, bipolar cell; PG, Parasol ganglion; MG, midget ganglion.