Fig. 1. Ventral view of the caudofemoralis muscle of the right hindlimb of Dipsosaurus dorsalis with the illiocaudalis and ishiocaudalis removed. The symbols indicate the approximate longitudinal and lateral locations of electromyographic (EMG) electrodes and sonomicrometry crystals. Electrodes were implanted at two sites. AT and PT indicate the auxiliary and primary tendons of the caudofemoralis muscle, respectively, and IL is the illioischiadic ligament.