METAZOAN ORGANIZATION 



109 



c. The Muscular System consists of muscles, the voluntary, stri- 

 ated group moves skeletal parts and accomplishes locomotion ; the 

 nonstriated, involuntary g-roup is concerned with the movements of 

 the internal organs (viscera), and the cardiac muscle produces the 

 heart action. 



{JuqularVdn 

 Carotid Artiry 



Trachea 



Sabclavian V. 



Precaval V. 



Dorsoil Aorta 



Pulmonary A. 



..Left Auricle 



LeftVentrick 



Xu.na 



.Diaphracfm 



Liver 



, Liuodenam 



'- -_ .Stomach 



Gall Bladder 

 Jro-nswrseColon 



D<?5c ending Colon 

 _ .1 Ascandinc^ Colon 



Fig. 46. — Ventral view of human maniltin showing parts of the principal systems. 



(Drawn by Edward O'Malley.) 



d. The Digestive System of the higher animals includes the mouth, 

 pharynx, esophagus, stomach, small intestine, large intestine, and ac- 

 cessory glands. The general form of the system is that of a tube, and 

 it is frequently called the alimentary canal. The functions of in- 



