ARTICULAR CARTILAGE 



43 



cavity or cell- space which it occupies in the matrix ; but after death, 

 and in consequence of the action of water and other agents, it tends to 

 shrink away from the capsule. The nucleus is round, and shows the 

 usual intranuclear network. 



WW" '$j/$ss7/ 



FIG. 49. BORDER OF ARTICULAR CARTILAGE SHOWING 



TRANSITION OF CARTILAGE-CELLS INTO CONNECTIVE- 

 TISSUE CORPUSCLES OF SYNOVIAL MEMBRANE. FROM 

 HEAP OF METATARSAL BONE, HUMAN. (About o40 



diameters.) 

 a, ordinary cartilage-cells ; b, b, with branching processes. 



FlG. 50. A CARTILAGE-CKLt 

 IN THE LIVING STATE, 

 FROM THE SALAMANDER. 



Highly magnified. 



FIG. 51. VERTICAL SECTION OF ARTICULAR CARTILAGE COVERING THE LOWER 

 END OF THE TIBIA, HUMAN. (Magnified about 30 diameters.) 



a, cells and cell-groups flattened conformably with the surface ; b, cell-groups irregularly 

 arranged ; c, cell-groups disposed perpendicularly to the surface ; d, layer of calcified 

 cartilage ; e, bone. 



In vertical section (fig. 51) the deeper cell-groups (c) are seen to be 

 arranged vertically to the surface, the more superficial ones (a) parallel 

 to the surface ; whilst in an intermediate zone the groups are irregu- 



