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An epicanthic fold or epicanthus [6] is a skin fold of the upper eyelid that covers the inner corner (medial canthus) of the eye. [3] However, variation occurs in the nature of this feature and the possession of "partial epicanthic folds" or "slight epicanthic folds" is noted in the relevant literature.
Pseudostrabismus is more likely to be observed in East Asian or Native American infants, due to the presence of epicanthic folds obscuring the medial aspect of each eye. Pseudostrabismus generally occurs in infants and toddlers , whose facial features are not fully developed.
Epicanthic folds are more common in Native Americans than most other populations in the world beside East/South East Asians. BUT, the occurance of epicanthic folds in Native Americans is much less prominant than with East Asians. They tend to be most common among indigenous of the northern most populations/tribes.
The term was motivated by the observation that people with Down syndrome often have epicanthic folds. [51] Coined in 1908, the term remained in medical usage until the 1950s. In 1961, its use was deprecated by a group of genetic experts in an article in The Lancet due to its "misleading connotations". [ 52 ]
Epicanthic eye folds are believed to be an adaptation protecting the eye from overexposure to ultraviolet radiation, and is presumed to be a particular trait in archaic humans from eastern and southeast Asia. A cold-adaptive explanation for the epicanthic fold is today seen as outdated by some, as epicanthic folds appear in some African ...
The Journey of Man: A Genetic Odyssey is a 2002 book by Spencer Wells, an American geneticist and anthropologist, in which he uses techniques and theories of genetics and evolutionary biology to trace the geographical dispersal of early human migrations out of Africa. The book was made into a TV documentary in 2003.
Winter count - Several Native American groups in the Great Plains have used winter counts as pictorial calendars for record-keeping. Writing system – many indigenous American cultures, such as the Olmec, Maya, Aztec, Zapotec, and Toltec, developed Mesoamerican writing systemss. Other native peoples to the north—mainly Algonquians—had ...
According to reports of Northern Paiute oral history, the Si-Te-Cah, Saiduka or Sai'i [1] (sometimes erroneously referred to as Say-do-carah or Saiekare [2] after a term said to be used by the Si-Te-Cah to refer to another group) were a legendary tribe who the Northern Paiutes fought a war with and eventually wiped out or drove away from the area, with the final battle having taken place at ...