Fig. 6. Sagittal section of a cricoid cartilage (c) revealing pathologic changes of the articular cartilage that were visible previous to the experiment and are not related directly to the experiment. Beneath a roughening of the articular surface (  arrows ), chondrocyte clusters are visible near the articular surface (  arrowheads )(40-year-old man). j =joint cavity; sb = subchondral bone. (Original magnification, 90.)