Table 1.
Morphological features of different types of inhibitory and excitatory lamina II neuron.
| Transmitter type | Morphological type | Number | Dendritic dimensions (μm) |
Axonal arbor |
Soma location |
|||||
|---|---|---|---|---|---|---|---|---|---|---|
| Rostrocaudal | Dorsoventral | I | II | III | IIo | IIo/i | IIi | |||
| Inhibitory (n = 28) | Islet | 12 | 466–1069 (731) | 42–176 (108) | 6 | 12 | 5 | 1 | 10 | 1 |
| Central | 4 | 191–385 (294) | 71–89 (76) | 1 | 4 | 1 | 1 | 2 | 1 | |
| Vertical | 3 | 103–216 (157) | 90–111 (103) | 1 | 3 | 0 | 3 | 0 | 0 | |
| Unclassified | 9 | 144–1639 (520) | 68–246 (135) | 4 | 9 | 3 | 3 | 2 | 4 | |
| Excitatory (n = 33) | Central | 4 | 189–324 (249) | 49–70 (57) | 3 | 4 | 2 | 1 | 1 | 2 |
| Radial | 7 | 147–271 (203) | 59–157 (118) | 4 | 7 | 4 | 2 | 3 | 2 | |
| Vertical | 12 | 200–546 (370) | 122–552 (300) | 9 | 12 | 10 | 7 | 3 | 2 | |
| Unclassified | 10 | 87–407 (221) | 21–299 (130) | 8 | 10 | 7 | 2 | 3 | 5 | |
The table shows the range of dendritic tree dimensions for each type (mean in brackets), together with the number of cells that had at least some of their axonal arbor in laminae I, II and/or III, and the number with their soma in each part of lamina II. Note that all cells had axons that arborised in lamina II.