OUTLINES OF PHYSIOLOGY,:- 



CHAPTER 'I: ''"- 



',' 



THE CELL. 



ALL the tissues of the body are made up of cells and inter- 

 cellular substance. All the cells are descended from one parent 

 cell, called the ovum, while the intercellular substance is created 

 through the medium of the cells. 



Nuclear 

 membrane. 



Linin. 



Nuclear fluid, 

 (matrix) . 



Nucleolus. 



Chromatin cords 



(nuclear 



network). 



Nodal enlarge- 

 ments of the 

 chromatin. 



Cell membrane. 

 -V Exoplasm. 



Microsomes. 

 Centrosome. 



^// ^ ' ^J J/r 7 Spongioplasm. 



Hyaloplasm. 



--==-- Foreign inclosures. 



FIG. i. Diagram of a cell. 

 Microsomes and spongioplasm are only partly drawn. (Brubaker.) 



A cell, which is the histologic unit of the body, may be denned 

 as an irregular round or oval mass of protoplasm of microscopic 

 size, enclosing a small indistinct spherical body, the nucleus. 



