title: [Ultrastructural aspect of the different levels of the lacrimal system (author's transl)].
abstract: Using the transmission electron microscope and the scanning electron microscope, we have found a different ultrastructure at the different levels of the lacrimal system: 1) tarsal conjonctiva: numerous microvilli on a relief of small valleys; 2) lacrimal punctum: the surface of the cell is flat with sparse microvillosti, sparse cilia and strong intercellular junction; 3) external part of the canaliculus: pavement epithelium with numerous microvillositi and pinocytosis, absence of cilia; 4) internal part of the canaliculus: the microvillositi are very small or absent; 5) lacrimal sac: the cilia are arranged by tufts scattered on this malpighian epithelium; 6) nasolacrimal duct: the cilia are numerous; 7) in the nose the cilia are extremely numerous.
mesh_terms: D002923:Cilia / Q000502:physiology / Q000648:ultrastructure*; D003228:Conjunctiva / Q000648:ultrastructure; D004848:Epithelium / Q000648:ultrastructure; D006801:Humans; D007765:Lacrimal Apparatus / Q000502:physiology / Q000648:ultrastructure*; D008854:Microscopy, Electron; D008855:Microscopy, Electron, Scanning; D009297:Nasal Mucosa / Q000648:ultrastructure; D009301:Nasolacrimal Duct / Q000648:ultrastructure
vernacular_title: Les cellules ciliées du système lacrymal. Ultrastructure comparée de la muqueuse lacrymale.