Search on: NICTITATING MEMBRANE 
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Descriptor English:   Nictitating Membrane 
Descriptor Spanish:   Membrana Nictitante 
Descriptor Portuguese:   Membrana Nictitante 
Synonyms English:   Third Eyelid  
Tree Number:   A13.660
Definition English:   A fold of the mucous membrane of the CONJUNCTIVA in many animals. At rest, it is hidden in the medial canthus. It can extend to cover part or all of the cornea to help clean the CORNEA. 
Indexing Annotation English:   ptosis of X ref THIRD EYELID: coord IM with EYELID DISEASES /vet (IM), not BLEPHAROPTOSIS
Allowable Qualifiers English:  
abnormalities anatomy & histology
blood supply chemistry
cytology drug effects
embryology enzymology
growth & development immunology
injuries innervation
metabolism microbiology
pathology physiology
physiopathology parasitology
radiography radiation effects
radionuclide imaging secretion
surgery transplantation
ultrastructure ultrasonography
virology  
Record Number:   9726 
Unique Identifier:   D009541 

Occurrence in VHL:
 

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