Table 1.

FA, eigenvalues, and fiber orientations of components of the EAS complex

		Eigenvalues, ×10−3 mm2/s			Fiber Orientation, degrees
Muscle Component	FA	λ1	λ2	λ3	Angle With z-Axis	Angle With y-Axis
Perineal body	0.21 ± 0.04*	2.01 ± 0.04*	1.67 ± 0.03*	1.32 ± 0.03*	88 ± 0	88 ± 0
EAS
Right	0.31 ± 0.04	1.70 ± 0.02	1.24 ± 0.02	0.99 ± 0.01	55 ± 1	12 ± 0
Left	0.28 ± 0.04	1.65.±0.02	1.20 ± 0.02	0.91 ± 0.02	52 ± 0	8 ± 0
Annococcygeal raphe	0.20 ± 0.09*	1.37 ± 0.01	1.08 ± 0.01	0.88 ± 0.01	80.68 ± 0.07	61.48 ± 0.3

Values are means ± SD. FA, fractional anisotropy; EAS, external anal sphincter.

^*P < 0.05 (by 2-tailed t-test).