CELLULAR DIFFERENTIATION 



55 



(Fig. 25, A) ; or it may contain numerous fibres which give coherence and elasticity. 

 The cells are usually rounded except where they have been flattened by mutual 



FIG. 24. 



FIG. 24. Fibrous connective tissues. A, ordinary connective tissue found binding muscle 

 and nerve fibres, showing the fibrous intercellular substance. The cells (c) are never conspicuous 

 in this tissue. B, adipose connective tissue showing fat-laden cells among the fibres (/). o, oil 

 droplets in the cells. 



Questions on the figures. In these two types of tissue which element gives 

 special character to the tissue, the cells or the intercellular substance ? How would 

 the deposition of large drops of oil in the cell affect the activity of the cell? Why? 

 Why are fatty deposits less hurtful amid connective tissue than elsewhere in the 

 body? 



FIG. 25. 



FIG. 25. Cartilage. A, Hyaline cartilage; B, fibrous cartilage. In the latter a large portion 

 of the intercellular substance is conspicuously fibrous. The cells occur in pockets (p) in the matrix;, 

 f, intercellular fibres. 



Questions on the figures. What are the points of similarity and of difference 

 in the two types of cartilage? In what manner do the multicellular pockets arise? 

 What is the nature and origin of the intercellular substance in each case? 



pressure, and usually occur in pockets in the matrix. Cartilage is bounded on its 

 free surfaces by a fibrous membrane, the perichondrium. This membrane assists in 

 the growth of the cartilage. There are no blood capillaries in cartilage. 



