NORMAL HISTOLOGY. 



55 



CHAPTER VI. 



THE BLOOD. 



The blood is a tissue of mesodermic origin. It consists of cells, 

 called corpuscles, and an intercellular substance the plasma, or 

 liquor sanguinis. The following outline will exhibit its composi- 

 tion as well as its structural elements : 



OUTLINE OF THE BLOOD. 



Corpus- 

 cles . . 



Colored 



Color- j 

 ...1 



Nucleated and bi-convex (amphibia, etc.). 

 Non-nucleated and bi-concave (mammalia). 

 ( Platelets. 



f Lymphocytes. 

 T Polynuclear elements. 



I Leucocytes j Eosinophilous leucocytes. 



[ Phagocytes. 



Fibrinogen. 



Plasma. 



Serum. 



f Fibrin-ferment.. 

 Serum-globulin. 

 Serum-albumin. 



Serosity 



Water. 



.Fibrin. 



Mineral salts. . . 



NaCl. 



Na 2 CO 3 . 



Na 3 P0 4 . 



Ca 3 (P0 4 ) 2 . 



Mg 3 (P0 4 ) 2 . 



Sulphates. 



The corpuscles are the cellular elements of the blood. In man 

 the red corpuscles, being devoid of protoplasm, are not alive, but 

 the leucocytes exist in the blood as so many distinct amoeboid ani- 

 mals. They can produce pseudopodia, and have the power of re- 

 producing themselves by normal fission and karyokinesis. The red 



