In humans, a<unk>  is a<unk><unk>  that extends across the palm of the hand, formed by the fusion of the two<unk><unk> s (known in palmistry as the "heart line" and the "head line"). Although it is found more frequently in persons with several abnormal medical conditions, it is not predictive of any of these conditions since it is also found in perfectly healthy persons. It is found in 1.5% of the world population in at least one hand.
Single transverse palmar crease
Clinodactyly
Pachydermodactyly
Sclerodactyly
Oligodactyly
Ectrodactyly
Polydactyly
Synpolydactyly