Table 2.

Mean ± SE for the angles (°) of the external oblique (EO), internal oblique (IO) and transversus abdominis (TrA) muscle fibers measured relative to the axis cutting through the transverse plane of the abdomen.

	Regionalization 1			Regionalization 2 (for comparison to human)
Muscle	1	2	3	Upper	Middle	Lower
EO	49 ± 2	71 ± 1	64 ± 2	49 ± 2	71 ± 1	71 ± 1
IO	−40 ± 3	−46 ± 2	−15 ± 2	−46 ± 2	−46 ± 2	−15 ± 2
TrA	5 ± 2	14 ± 1	28 ± 1	5 ± 2	14 ± 1	28 ± 1

Regionalization 1 divides the muscles into three regions corresponding to Fig. 1. Regionalization 2 divides the same muscles into three regions chosen to facilitate comparison to human, corresponding to the data provided in Table 2 of Urquhart et al. (2005) (see text for details). Positive angles indicate an infero-medial fiber direction; negative angles indicate an infero-lateral fiber direction.