Simian crease

Transverse palmar crease; Palmar crease; Simian crease

A single palmar crease is a single line that runs across the palm of the hand. People most often have 3 creases in their palms.

The crease is most often referred to as a single palmar crease. The older term "simian crease" is not used much anymore, since it tends to have a negative meaning (The word "simian" refers to a monkey or ape).

Single palmar crease

There are typically two creases in the palm, but in some people, only one crease is present. A single palmar crease occurs in about 1 out of 30 people, but is also frequently associated with other conditions such as Down syndrome, Aarskog syndrome or fetal alcohol syndrome.



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