“…Penetration by capillary loops of the calcified cartilage, and in some instances the tidemark, also has been observed by scanning electron microscopy (Mital and Millington, 1970;Redler etaL, 1975). Vascular channels are 5 0 -6 0 μπι wide at the base and 5-10 μπι wide in the superficial zone of the calcified cartilage (Millington and Clarke, 1973). The vascular loops anas tomose at their venous ends, forming a sinusoidal network.…”