Anatomical characteristics of the identified sensory afferents
| Afferent type | Area of the long hair afferent (μm2) | Area of the medium hair afferent (μm2) | Percent area of the medium hair afferent that overlaps with the long hair afferent | Percent area of the long hair afferent that overlaps with the medium hair afferent |
|---|---|---|---|---|
| 1 | 1029.05 ± 167.4 | 714.14 ± 16.31 | 59.07 ± 0.84 | 40.95 ± 0.57 |
| 2 | 1319.70 ± 266.4 | 1002.4 ± 132.23 | 51.36 ± 0.70 | 39.01 ± 0.53 |
| 3 | 1113.04 ± 277.8 | 676.68 ± 156.54 | 45.00 ± 0.89 | 27.36 ± 0.54 |
| 4 | 1392.86 ± 147.9 | 1052.13 ± 204.45 | 44.38 ± 0.66 | 33.52 ± 0.50 |
| 5 | 1052.15 ± 227.0 | 847.55 ± 102.03 | 67.30 ± 1.07 | 54.21 ± 0.86 |
| 6 | 1062.8 ± 273.5 | 829.72 ± 210.10 | 49.02 ± 0.72 | 38.27 ± 0.56 |
| 7 | 1314.72 ± 201.6 | 643.78 ± 71.71 | 54.05 ± 0.99 | 26.74 ± 0.49 |
| 8 | 1275.6 ± 340.4 | 747.22 ± 158.63 | 49.16 ± 0.86 | 28.80 ± 0.50 |
| 9 | 1254.34 ± 322.8 | 955.76 ± 91.88 | 61.27 ± 0.91 | 46.68 ± 0.69 |
| 10 | 1492.97 ± 265.06 | 648.61 ± 85.65 | 49.02 ± 0.95 | 21.30 ± 0.41 |
| 11 | 1072.70 ± 94.9 | 708.69 ± 149.64 | 63.91 ± 0.90 | 42.22 ± .060 |
| 13 | 1488.9 ± 303.9 | 835.35 ± 92.05 | 78.80 ± 0.94 | 43.65 ± 0.72 |
The total surface area of the L and M afferents as well as the amount of anatomical overlap between each pair were measured for each identified afferent type. Values are in square micrometers ± SD. The surface area of each M afferent is significantly smaller than the L afferent with the same directionality. In most cases larger less area of each M afferent overlaps with the L afferent of similar directional tuning. The percent overlap that each L afferent overlaps with each M afferent is much lower than the opposite case.