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Fig. 1. Left lateral view of the hypaxial musculature of an adult Ambystoma tigrinum. Muscle fibers in the lateral pair (OES and OEP) slope from craniodorsal towards caudoventral, whereas muscle fibers in the medial pair (OI and TA) slope from cranioventral towards caudodorsal. OES, m. obliquus externus superficialis; OEP, m. obliquus externus profundus; OI, m. obliquus internus; TA, m. transversus abdominis; RA, m. rectus abdominis. The figure is taken from Simons and Brainerd (Simons and Brainerd, 1999) (with permission). Copyright 1999 Wiley-Liss, Inc., a subsidiary of John Wiley & Sons, Inc.