Apical structure of human respiratory cilia.

摘要: The apical structure of human respiratory cilia was studied using thin and thick sectioning techniques. distal end the mature cilium is narrowed presents dense material a crown-shaped glycocalyx. crown composed three to seven bristles, having mean length 31 nm showing periodic structure. capping part plate an electron-dense cap tightly bound central each nine peripheral A microtubules. Lateral spokes link microtubules internal ciliary plasma membrane filaments radiate from crown. These structures may be involved in several functions associated with microtubule assembly as well movement mucociliary transport.