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:  
AB abnormalities AH anatomy & histology
BS blood supply CH chemistry
CY cytology DE drug effects
EM embryology EN enzymology
GD growth & development IM immunology
IN injuries IR innervation
ME metabolism MI microbiology
PS parasitology PA pathology
PH physiology PP physiopathology
RE radiation effects RA radiography
RI radionuclide imaging SE secretion
SU surgery TR transplantation
US ultrasonography UL ultrastructure
VI virology  
Record Number:   9726 
Unique Identifier:   D009541 

Occurrence in VHL: 		 

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