AND PHYSIOLOGY. 



29 



Another primary element of the nervous system is com- 

 posed of nucleated cells, containing a finely granulated sub- 

 stance. These sometimes have processes which give them a 

 caudate or stellate form, as in Fig. 29. 



Fia. 29. 



79. An Organ. The System — Such are the tissues which, 

 combined in various proportions, make up the organs of the 

 human body. And by the term organ we mean a part usually 

 composed of several tissues adapted to certain functions. And 

 though harmoniously united into a single system, that is, the 

 body, the anatomist can dissect and describe them separately. 

 In this work the following order will be adopted : 



1. Osteology, or an account of the Bones or framework of 

 the system. 



2. Myology, an account of the Muscles or the moving pow- 

 ers of the system. 



3. Splanchnology, or the Nutritive Organs. 



4. Angiology, an account of the Circulating System of the 

 arteries and veins. 



7f. Define an organ. 



What is the system ? What is Osteology ? Myology? etc. 



