SYSTEMATIC SYNTHESIS OF ORGANS INTO APP. 381 



better be divided into digestory, brainial, muscular, 

 bronchial, cutaneous, and renal. 



1213. Remark. Of course, if one part of an apparatus requires 

 more Blood than usual, all parts of it will, and it will be philosophical 

 and correct to suppose that Blood will in such cases be supplied to all 

 parts if to any, as otherwise action could not take place ; yet THE LATTER 



DIVISION IS MOST PRACTICAL. 



1214. THE DIGESTORY DIVISION OF THE SYSTEMIC 

 CIRCULATION is peculiar in this, that the Blood flowing 

 through it, and that from the spleen, does not pass 

 directly to the lungs, but is first circulated through the 

 liver. 



1215. THE MUSCULAR AND CUTANEOUS DIVISIONS 

 have the same general branches, which should be the 

 case, since the activity of the muscles is attended with 



. the production of heat, which should be lost through the 

 skin ; and therefore the exercise of the muscles brings 

 Blood to themselves and the skin at the same time. 



1216. THE BRONCHIAL DIVISION must be carefully 

 distinguished from the pulmonary circulation. 



1217. Remark. It MUST BE REMEMBERED that the bronchial artery 

 arises from the systemic aorta, and opens into the nutrient capillaries 

 of all parts of the lungs, which may thus be overcharged with systemic 

 Blood, limiting the space to be occupied by the air, as well as tending 

 to excite disease in their inner surface membrane (bronchitis), in their 

 outer surface membrane (pleurisy, pleuritis), or in the substance of the 

 lung (pneumonitis), in accordance with the natural divisions of the bron- 

 chial artery and its capillaries. 



1218. THE BRAINIAL DIVISION MAY BE SUBDIVIDED in 

 accordance with the classes of ganglia that it supplies. 



1219. Inf. (I.) Increased circulation through one division only of 

 the systemic circulation must be attended with diminished circulation in 

 one or all of the others. (2.) If Blood is required in large quantities in 

 one it should not be directed to another. (3.) If Blood is shut out from 

 one it must overcharge some others. (4.) The action of the heart must 

 harmonize with the conditions of the other parts of the circulation. 



1213. Why is - ? 1214. What peculiar in ? 1215. What said of ? 1216. What 

 said of - ? 1217. What ? 1218. How ? 1219. Inf. 



