Summary
Developing cilia and non-ciliated centrioles are both present in the rat choroid cell studied with the electron microscope. The development of the cilium begins with the appearance of a thick-walled vesicle close to the centriole or in contact with it. Very soon this vesicle lines the distal extremity of the centriole. The growing ciliary shaft invaginates the vesicle, forming a temporary ciliary sheath. This sheath isolates the growing cilium from its environment.
Degenerating ciliary shafts are by no means rare. They are interpreted as evidence of a biological cycle of the cilia. Club-shaped forms are also frequent.
Non-ciliated centrioles are sometimes in contact with striated structures consisting of alternating dark and light bands, separated by a distance of 600 Å. These formations (treillis) are different from the “pericentriolar satellites”. On morphological grounds, they might be considered as centriole precursors.
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Martínez Martínez, P., Daems, W.T. Les phases précoces de la formation des cils et le problème de l'origine du corpuscule basal. Z. Zellforsch. 87, 46–68 (1968). https://doi.org/10.1007/BF00326560
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DOI: https://doi.org/10.1007/BF00326560