SYSTEMATIC ANALYSIS OF THE BODY. 41 



64. THE DIAPHRAGM is a thin, active partition, 

 chiefly muscular, attached 



. . 



by its margin to the lower 

 border of the chest, and 

 arching upward, as seen 

 by the figure of it, Fig. 1, 

 Plate 7, also Fig. 66. 



Fig. 66 represents front walls of 

 chest removed, 2 being upper ribs 

 attached to 1, the upper portion of 

 sternum, of which 7 is the lower 

 portion, to each side of which the 

 gristly ends of the lower ribs are 

 attached. 3, the spinal column. 

 4, the centre, and 5, 6, the side arch- 

 es of-the Diaphragm. 



65. THE MOVEMENTS 

 OF THE TRUNK-WALLS next 

 require muscles, which 



must be connected with the brain (so, indeed, all parts 

 of the Trunk-walls must be) by means of nerves, and 

 then the whole must be covered by the skin, and inter- 

 woven by the blood-tubes, making up the five general 

 organs, similar, except in size and form, to those of the 

 head and neck. 



f Skeleton. 



Muscles. (Pelvic. 



TRUNK-WALLS -I Nerves. TRUNK-CAVITIES { Abdominal. 



Skin. ( Costal. 



( Blood-tubes. 



66. THE BLOOD-MAKING OR SANGUIFICATORY OR- 

 GANS, forming the Contents of the Trunk- walls, require 

 exactly the space afforded by the cavities of the Trunk- 

 walls, and exactly the same structure that they have, so 

 that, if they had been made for the purpose of enclosing, 

 protecting, carrying, and assisting the Contents, nothing 

 could have been added, removed, nor changed. The 



64. What is - ? Describe Fig 66. 65. What do require? Write tables of. 

 3. What do require' 



