The Frog: A Representative Vertebrate 59 



to a bone. They may be of different shapes : some are flat sheets, 

 some are spindle-shaped, and still others are long and bandlike, and 

 a few have the fibers in a circular manner to form sphincters. Muscles 

 are often attached to bones by means of heavy strands of connective 

 tissue known as tendons. 



VENTRAL 



DORSAL 



Fig. 14.— Superficial muscles of the bullfrog. 



