HYALINE CARTILAGE 



49 



more and more flattened or elongated, their long axes gradually 

 revolving from a perpendicular in the center of the plate until at 

 the surface it becomes parallel with the perichondrium. Each 

 cartilage cell is inclosed within a small space or lacuna, which 

 during life it entirely fills. 



Cell multiplication within the cartilage is peculiar in that cell 

 division occurs within a firm capsule and results in the forma- 



FIG. 51. TRANSECTION OF A PLATE OF HYALINE CARTILAGE, FROM THE TRACHEA OF A 



CHILD. 



The margin of the fibrous perichondrium can be seen on either side of the plate of 

 cartilage, in the upper right hand corner and lower left hand corner of the figure. Hem- 

 atein and eosin. Photo, x 400. 



tion of two daughter cells, which at first lie within the same 

 encapsuled space. These two cells may each again undergo 

 division within the same space with formation of four new cells. 

 As a result of this peculiar method of cell division the cartilage 

 cells are arranged in groups of two, four, or even eight cells. Each 

 of the cells in the group deposits its capsule, and thus forms a 



