原げん始し反はん射しゃ

noun

primitive reflex

Physiology term for innate, automatic responses present in infants, such as the Moro reflex or rooting reflex.

• 新しん生せい児じの原げん始し反はん射しゃは、成せい長ちょうとともに消しょう失しつする。

  A newborn's primitive reflexes disappear as they grow.