Primary cilia of the corneal endothelium

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Abstract
A primary cilium is a normal component of every rabbit corneal endothelial cell, rather than being a rare or sporadic organelle, as previously believed. Like other cilia of this type, it possesses an axonemal organization of 9 + 0 which converts distally to 8 + 1; it occurs only 1 per cell; the basal body is accompanied by a proximal centriole. Additional structures associated with the basal body are 9 transitional fibers, 4 striated satellite arms and several rootlets. Ladderlike structures extend between the 2 centrioles to form the wall of a barrel. Reexamination of primary cilia from other tissues indicates that the ultrastructure of endothelial cilia may be characteristic of primary cilia in general.