CHAP. XIV 



MUSCLES AND EXERCISE 



191 



As to shape, muscles may be grouped into many 

 different classes, known by separate names as fusiform, 



FIG. 108. Muscles of different shapes (Zuppke). 



penniform, bipenniform, tripennifoim, digastric, poly gas- 

 tric, sphincter, etc. The figures above will give you 

 some idea of the variety of shape found among the 

 voluntary muscles. 



