LECTURE XIII. 
ARTICULAR CARTILAGE. 
Haying now described to you the principal forms 
of membraniform and permanent cartilage. I pass 
on to notice that variety of permanent cartilage, which, 
from its entering into the formation of joints, is called 
Articular. It differs in structure in the young and 
in the adult animal, and it is this form of cartilage 
which, in the young condition is largely supplied with 
blood-vessels, and undergoes a constant and successive 
process of ossification, on its attached surface. If a 
vertical section of foetal cartilage be examined, the part 
nearest the articular surface (Fig. 113 , a) exhibits 
numerous small cartilage-cells, arranged without much 
order, and the nucleus of each cell occupying its whole 
diameter. As we proceed towards the attached surface, 
the cartilage- cells begin to be arranged in parallel rows, 
