Fig. 2. Lateral view of the anatomy of the sternohyoideus in situ, showing the location of sonomicrometry crystals and EMG electrodes in this study. The sternohyoideus originates on the pectoral girdle and on posterior hypaxial myosepta and inserts on the urohyal bone. There are three myomeres between the pectoral girdle and the urohyal. 1 mm crystals were placed rostal and caudal to the middle myomere. An electrode was placed in the middle myomere. 2 mm crystals were placed on the symphysis of the lower jaw and on the anterior palate just lateral to the vomer. For this figure the hyoid, lower jaw and upper jaw were sectioned, and the gills and part of the suspensoria were removed to expose the sternohyoideus.