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CROSS-SPECIES ANATOMY - ANNOTATIONS

The Basic subset of the UBERON integrated, cross-species anatomy ontology is downloaded weekly from http://berkeleybop.org/ontologies/uberon/basic.obo. For more information about this ontology see the "About" page on the UBERON website at http://uberon.github.io/about.html.
Term:tear film
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Accession:UBERON:0022287 term browser browse the term
Definition:An aqueous substance that covers the anterior surface of the eyeball, keeping the cornea wet.
Comment:[function-note] "maintenance of the avascular transparent corneal epithelium"; [structure-note] "The tear film is structurally complex with three distinct layers: a surface lipid layer, a middle aqueous layer, and an inner mucus layer[http://physiologyonline.physiology.org/content/13/2/97]"
Synonyms:exact_synonym: precorneal film

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Term paths to the root
Path 1
Term Annotations click to browse term
  UBERON ontology 0
    anatomical entity 0
      material anatomical entity 0
        organism substance 0
          secretion of exocrine gland 0
            tear film 0
Path 2
Term Annotations click to browse term
  UBERON ontology 0
    anatomical entity 0
      material anatomical entity 0
        anatomical structure 0
          multicellular anatomical structure 0
            multicellular organism 0
              embryo 0
                embryonic structure 0
                  embryonic tissue 0
                    germ layer / neural crest 0
                      germ layer 0
                        ectoderm 0
                          ectoderm-derived structure 0
                            neurectoderm 0
                              presumptive neural plate 0
                                neural plate 0
                                  pre-chordal neural plate 0
                                    eye primordium 0
                                      immature eye 0
                                        optic vesicle 0
                                          optic cup 0
                                            camera-type eye 0
                                              eyeball of camera-type eye 0
                                                anterior segment of eyeball 0
                                                  tear film 0
paths to the root