Table 3.
Morphology and synaptic connectivity of ON bipolar axon terminals with ganglion cells.
| Bipolar cell type (n)a | Distance between axon and the GCL (μm) | Axon arbor thickness (μm) | Axon arbor area (μm2) | Number of ribbons | Number of PG outputs per BC (n = 5)b | Number of MG outputs per BC (n = 25)c | Number of BC inputs per MG (n = 5)d |
|---|---|---|---|---|---|---|---|
| IMB (5) | 6.0 ± 0.8 | 9.7 ± 2.3 | 67.9 ± 15.4 | 85.0 ± 9.0 | 14.6 ± 3.2 | 73.8 ± 6.9 | 191.8 ± 21.3 |
| BB (4) | 3.3 ± 1.0 | 9.7 ± 1.3 | 198.7 ± 36.5 | 59.0 ± 7.5 | 0.0 | 1.8 ± 1.7 | 1.2 ± 1.6 |
| DB4 (7) | 11.1 ± 1.0 | 8.0 ± 1.4 | 246.7 ± 56.7 | 97.3 ± 3.8 | 25.0 ± 5.6 | 14.7 ± 6.6 | 10.0 ± 7.0 |
| DB5 (8) | 11.4 ± 0.8 | 7.5 ± 2.8 | 189.3 ± 50.2 | 67.8 ± 11.0 | 12.0 ± 4.0 | 4.8 ± 3.5 | 4.0 ± 1.6 |
| DB6 (4) | 2.3 ± 0.9 | 11.6 ± 3.1 | 647.7 ± 110.8 | 98.0 ± 8.7 | 2.0 ± 2.8 | 67.8 ± 8.8 | 30.2 ± 5.2 |
| GB (2) | 9.6 ± 2.3 | 6.5 ± 2.1 | 1061.5 ± 72.2 | 86.5 ± 14.8 | 27.5 ± 6.4 | 4.0 ± 1.4 | 0.4 ± 0.9 |
| 237.6 ± 21.0e |
a
Number of sample bipolar cells of each type.
b
Number of PG cells examined for the measurement of bipolar-PG contacts per bipolar cell.
c
Number of MG cells examined for the measurement of bipolar-MG contacts per bipolar cell.
d
Number of MG cells sampled for the measurement of bipolar-MG contacts per MG cell.
e
The total of input synaptic contacts from all types of BCs.