Abstract
The incidence and morphology of canine chondrocytic cilia were studied using serial sections and transmission electron microscopy. Of the 111 chondrocytes available for study, 104 cells had one cilium. In each of the other seven cells, although no cilium was observed, one of the centrioles appeared to contact the plasma membrane. The structure of a chondrocytic basal body included rootlets, a striated basal foot, nine alar sheets, and A-C and A-A linkers. The outside diameter, inside diameter, and triplet angle gradually decreased from base to apex. The basic axonemal structure consisted of nine peripheral doublets. Arms, radial spokes, and central microtubules typical of motile cilia appeared to be absent. Toward the base of the ciliary shaft certain doublets bent toward the center of the shaft and terminated. The remaining peripheral doublets also terminated one doublet at a time along the length of the shaft. Three potential functions of chondrocytic cilia are discussed.
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