OP THE ORGANS. 93 



rajuses rests entirely on the consideration of the functions, 

 while that of the systems or the genera depends upon the re- 

 semblance of the parts with each other. We have seen as 

 above the enumeration of the genera of the organs; we shall 

 now show how the organs are united in apparatuses of func- 

 tions. 



The bones and their dependencies, viz: the periosteum, the 

 medulla, the greater part of the cartilages, the ligaments, the 

 synovial capsules, constitute & first apparatus of organs which 

 determine the form of the body, which serve as supports for 

 all its parts, and particularly as an envelope to the nervous 

 centres, and which, by the mobility of the articulations, re- 

 ceive and communicate the movements determined by the 

 muscles. 



The muscles, the tendons, the aponeuroses, bursse mucosae, 

 form the apparatus of motion. 



The cartilages and the muscles of the larynx, and various 

 other parts form that of phonatiorf, or of the voice. 



The skin, the other senses, and the muscles which move 

 them, &c. form the apparatus of the sensations. 



The nervous centres and the nerves form that of innerva- 

 tion. 



The alimentary canal, from the mouth to the anus, with all 

 its numerous dependancies, constitute that of digestion. 



The heart and the vessels, that of circulation. 



The lungs, that of respiration. 



The glands, the follicles and the perspiratory surfaces, form 

 the apparatus of the secretions; but the greater part of these 

 organs serving, for other functions, are comprehended in their 

 apparatuses. There remains but the urinary secretions, whose 

 organs alone constitute an apparatus. 



The genital organs constitute a different apparatus in each 

 sex. 



Finally, the ovum, and the foetus it encloses, form a last group 

 or apparatus of organs. 



