A simian crease is a single palmar crease, often a variant of normal, but frequently associated with Down's syndrome.
The name alludes to the fact that other primates have a single palmar crease.
The creasing of the palm relates to the way the hand is held in utero.
Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page