Palmprint atd angle greater than 45 °

Palmprint atd angle greater than 45 ° is a special appearance of congenital stupidity (21Ⅲ signs, Down syndrome) caused by mental retardation caused by chromosomal abnormalities. This symptom occurs in about 40% of patients. Mental retardation refers to the fact that before the maturity of an individual (usually before the age of 18), the mental function caused by mental retardation, mental retardation or obstruction is significantly lower than the same age level, and accompanied by social adaptation difficulties It is a syndrome mainly characterized by.