TABLE 2.
Dimensions (mean ± standard deviation) of the stapes in humans and guinea pigs
| Description | Symbol | Human | Guinea pig |
|---|---|---|---|
| Long length of footplate | a [mm] | 2.81 ± 0.158 | 1.44 ± 0.034 |
| Short length of footplate | b [mm] | 1.27 ± 0.109 | 0.66 ± 0.029 |
| Long length/short length of the footplate | a/b | 2.22 ± 0.197 | 2.19 ± 0.092 |
| Footplate area (medial surface) | A FT [mm2] | 3.03 ± 0.331 | 0.79 ± 0.039 |
| Projected footplate area (to x–y plane) | A FT_proj [mm2] | 2.86 ± 0.316 | 0.76 ± 0.034 |
| Projected footplate area/footplate area | A FT_proj/A FT | 0.94 ± 0.015 | 0.97 ± 0.007 |
| Equivalent diameter of the footplate area | d FT_eq [mm] | 1.96 ± 0.108 | 1.00 ± 0.024 |
| Equivalent diameter of the projected footplate area | d FT_eq_proj [mm] | 1.90 ± 0.106 | 0.98 ± 0.022 |
| Volume of the stapes | V ST [mm3] | 1.43 ± 0.242 | 0.19 ± 0.017 |
| x-coordinate of the center of the mass | x c [mm] | 0.001 ± 0.091 | −0.002 ± 0.011 |
| y-coordinate of the center of the mass | y c [mm] | −0.116 ± 0.085 | −0.043 ± 0.026 |
| Height (z-coordinate) of the center of the mass | h c [mm] | 1.22 ± 0.157 | 0.40 ± 0.033 |
| Total height of the stapes | h [mm] | 3.28 ± 0.210 | 1.33 ± 0.039 |
| Height of the center of the mass/total height | h c/h | 0.37 ± 0.041 | 0.30 ± 0.027 |
| Total height/equivalent diameter of the footplate | h/d FT_eq_proj | 1.72 ± 0.123 | 1.35 ± 0.042 |
n = 53 (footplate dimensions) or n = 32 (other dimensions) for human and n = 11 for guinea pig