12 



THE ELEMENTARY TISSUES 



(i) Mucous Tissue. This is the most immature form of 

 connective tissue and consists of a loose protoplasmic network 

 having a gelatinous intercellular substance. It is found in 



FIG. 7. Tissue of the jelly of Wharton from umbilical cord. 



a, Connective-tissue corpuscles; b, fasciculi of connective-tissue fibers; c, spherical 

 cells. (Halliburton after Frey.) 



FIG. 8. Retiform tissue from a lymphatic gland, from a section which 

 has been treated with dilute potash. (Halliburton after Schafer.} 



Wharton's jelly in the embryo and in certain tumors, known 

 as myxoma. 



(2) Reticular Tissue. This is composed chiefly of a net- 

 work of connective-tissue cells which enclose a mass of lymphoid 



