658 



THE SKELETAL SYSTEM 



'i^^&Y\^'f^'^ &)^M^ 1^^ V?^>S1^^- Intercellular (jr, 



,0/ 







=a;M 







PHECARTILiGt STAGE 



ERiCHONDRiai. (VASCULAR), bud; />/52:' •' l'/*l"" , " ? wh iteO) " V cartTlage -celYs and capsules 



FIBROCARTILAGE 

 GMONDRIN SHOWN IN BLACK 

 AROUND CARTILAGE CELLS 



LASTIC CART 

 05TIC FIBERS 



Fig. 313. Types of cartilaginous tissue. (A-C) Development of hyaline cartilage. 

 (D) Destruction of cartilage by perichondrial vascular bud preparatory to ossification. 

 The cartilage spicules may be infiltrated with calcium salt at this period. (Redrawn 

 from Bremer. 1936, Textbook of Histology, Philadelphia. Blakiston.) (E) Fibrocar- 

 tilage. from area of tendinous union with bone. (F) Elastic cartilage from human, 

 larynx. (Redrawn and modified from Bremer. 1936, Textbook of Histology, Philadelphia, 

 Blakiston.) 



b. Adipose Tissue 



Adipose tissue contains a fibrous network of white and elastic fibers, be- 

 tween which fat cells develop. Eventually, the fibrous connective tissue is 

 displaced and pushed aside by the fat-containing elements (fig. 312F). 



2. Cartilage 



Cartilage is a type of connective tissue with a solid intercellular substance. 

 The latter is composed of a fibrous framework filled with an amorphous ground 

 substance. Unlike bone, the intercellular substance may be readily cut with 

 a sharp instrument. Three main types of cartilage are found: 



( 1 ) hyaline, 



(2) fibrous, and 



( 3 ) elastic. 



a. Hyaline Cartilage 



Hyaline cartilage (fig. 313A-C) is the most widespread variety of cartilage. 

 It is characterized by a solid, amorphous, ground substance, slightly bluish 

 in appearance, easily bent and capable of being cut with a sharp instrument. 



