Table 3.
Distribution and innervation density estimate of cutaneous afferents across the foot sole
| Foot Sole Regions |
|||||||||
|---|---|---|---|---|---|---|---|---|---|
| GT | Toes | MedMet | MidMet | LatMet | MedArch | MidArch | LatArch | Heel | |
| Mean area, cm2 | 13.2 | 16.9 | 17.2 | 16.6 | 14.2 | 19.3 | 20.4 | 21.6 | 38.8 |
| Total area, % | 7.4 | 9.5 | 9.7 | 9.3 | 8.0 | 10.8 | 11.4 | 12.1 | 21.8 |
| All afferents, % | 6.6 | 23.1 | 4.9 | 6.3 | 9.3 | 7.7 | 7.4 | 19.5 | 15.1 |
| No. of afferents | |||||||||
| All afferents | 24 | 84 | 18 | 23 | 34 | 28 | 27 | 71 | 55 |
| FAI | 13 | 44 | 7 | 12 | 17 | 15 | 12 | 40 | 24 |
| FAII | 4 | 5 | 3 | 5 | 2 | 2 | 5 | 7 | 10 |
| SAI | 3 | 25 | 1 | 1 | 5 | 3 | 3 | 13 | 9 |
| SAII | 4 | 10 | 7 | 5 | 10 | 8 | 7 | 11 | 12 |
| Likelihood ratios | |||||||||
| All afferents | 0.89 | 2.44 | 0.51 | 0.68 | 1.17 | 0.71 | 0.65 | 1.61 | 0.69 |
| FAI | 0.96 | 2.52 | 0.39 | 0.70 | 1.16 | 0.75 | 0.57 | 1.80 | 0.60 |
| FAII | 1.26 | 1.23 | 0.72 | 1.25 | 0.58 | 0.43 | 1.02 | 1.34 | 1.07 |
| SAI | 0.65 | 4.19 | 0.16 | 0.17 | 0.99 | 0.44 | 0.42 | 1.70 | 0.66 |
| SAII | 0.73 | 1.43 | 0.98 | 0.72 | 1.69 | 1.00 | 0.83 | 1.23 | 0.74 |
| Innervation density per cm2 | |||||||||
| All afferents | 8.53 | 23.25 | 4.88 | 6.48 | 11.16 | 6.78 | 6.21 | 15.39 | 6.62 |
| FAI | 4.62 | 12.18 | 1.90 | 3.38 | 5.58 | 3.63 | 2.76 | 8.67 | 2.89 |
| FAII | 1.42 | 1.38 | 0.81 | 1.41 | 0.66 | 0.48 | 1.15 | 1.52 | 1.20 |
| SAI | 1.07 | 6.92 | 0.27 | 0.28 | 1.64 | 0.73 | 0.69 | 2.82 | 1.08 |
| SAII | 1.42 | 2.77 | 1.90 | 1.41 | 3.28 | 1.94 | 1.61 | 2.38 | 1.45 |
GT, great toe; MedMet, MidMet, and LatMet, medial, middle, and lateral metatarsals; MedArch, MidArch, and LatArch, medial, middle, and lateral arch; FAI, fast-adapting type I; FAII, fast-adapting type II; SAI, slowly adapting type I; SAII, slowly adapting type II.