Table 1.
Terminal innervation parameters for calyx, bouton, and dimorph afferents
| Calyx (n=42) | Dimorph (n=34) | Bouton (n=43) | ||||
|---|---|---|---|---|---|---|
|
| ||||||
| Range | Mean (SD) | Range | Mean (SD) | Range | Mean (SD) | |
| Axon diameter (μm) | 1 – 5.8 | 3.2 (0.8) | 1.7 – 5.3 | 2.9 (0.8) | 1.6 – 3.9 | 2.6 (0.6) |
| Fiber length (μm) | 5 – 56 | 24.0 (14.4) | 31 – 242 | 97 (49.3) | 115 – 474 | 260 (90.2) |
| Fiber volume (μm3) | 25 – 423 | 189 (118) | 52 – 657 | 273 (154) | 146 – 1054 | 401 (200) |
| Branch order | 1 – 2 | 1.1 (0.35) | 1 – 6 | 3.7 (1.2) | 3 – 9 | 5.9 (1.5) |
| Branches | 1 – 3 | 1.3 (0.8) | 2 – 25 | 9.4 (5.1) | 8 – 50 | 24.7 (9.8) |
| Innervation area (μm2) | 150 – 751 | 349 (138) | 155 – 895 | 452 (151) | 167 – 1078 | 561 (211) |
| Type I HC | 2 – 9 | 4.3 (1.8) | 1 – 7 | 3.2 (1.3) | ||
| Boutons | 1 – 23 | 6.7 (4.8) | 8 – 48 | 26.3 (10.5) | ||
| Terminals | 12 – 9 | 4.3 (1.8) | 1 – 26 | 9.8 (5.0) | 8 – 48 | 26.3 (10.5) |
| Terminal density (/μm2) | .005 – .022 | .013 (.004) | .007 – .044 | .022 (.010) | .024 – .104 | .049 (.019) |
SD – standard deviation.