when was down syndrome discovered
The earliest known depiction of a person with Down syndrome is an angel in a Flemish painting dated 1515. In 1866, Doctor John Langdon Down first described Down syndrome as a disorder, but he misunderstood how Down syndrome arises.The cause of Down syndrome was discovered rather recently in 1959.Down syndrome is a genetic disorder and the most common cause of cognitive impairment. All individuals with Down syndrome have mild to moderate learning disabilities, distinctive facial features, and low muscle tone (hypotonia) in early infancy.n 1866, Doctor John Langdon Down first described Down syndrome as a disorder, but he misunderstood how Down syndrome arises. The cause of Down syndrome was discovered rather recently in 1959.