GENERAL VIEW OF THE BODY 



Tissue Groups. In the construc- 

 tion of the body the tissues are 

 grouped together to form its various 

 divisions or parts. A group of tissues 

 which serves some special purpose is 

 known as an organ. The hand, for 

 example, is an organ for grasping 

 (Fig. i). While the different organs 

 of the body do not always contain 

 the same tissues, and never contain 

 them in the same proportions, they 

 do contain such tissues as their work 

 requires and these have a special 

 arrangement one adapted to the 

 work which the organs perform. 



In addition to forming the organs, 

 the tissues are also grouped in such 

 a manner as to provide supports for 

 organs and to form cavities in which 

 organs are placed. The various cavi- 

 ties of the body are of particular 

 interest and importance. The three 

 largest ones are the cranial cavity, 

 containing the brain; the thoracic 

 cavity, containing the heart and the 

 lungs ; and the abdominal cavity, 



containing the stomach, the liver, the FlG - I - ~~ Han< * 

 .... 1-1 forearm, showing me 



intestines, and other important organs grouping of mus j ar and 



(Fig. 2). Smaller cavities serving connective tissues in the 



different purposes are also found. or g an for g ras P in g- 



Organs and Systems. The work of the body is carried 

 on by its various organs. Many, in fact the majority, of 

 these organs serve more than one purpose. The tongue 



and 



showing the 



