1. 
   Simian crease
   Simian crease: A single transverse palmar crease, a minor variation associated with Down syndrome (trisomy 21). Also called a four-finger crease, single palmar flexion crease, single upper palm crease, or line. There are most often two transverse palmar creases, a proximal one and a more distal one,...
   Found op http://www.medterms.com/script/main/art.html?articlekey=40405
   
   
2. 
   simian crease
   A single palmar crease associated with Down's syndrome. ... (27 Sep 1997) ...
   Found op http://www.mondofacto.com/facts/dictionary?simian+crease
   
   
3. 
   simian crease
   Type: Term Definitions: 1. a single transverse palmar crease formed by fusion of the proximal and distal palmar creases, so called because of its similarity to the transverse flexion crease seen in some monkeys; a common but not pathognomonic feature of Down syndrome; also found in 1% of the normal ...
   Found op http://www.medilexicon.com/medicaldictionary.php?t=21157
   
   
4. 
   Simian Crease
   A major crease across the entire palm of the hand that is frequently seen in individual's with Down syndrome.
   Found op http://www.pregnology.com/AZ/S/3
   
   

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