Answered: Why do many of the reflexes of infancy…

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Why do many of the reflexes of infancy disappear by 1 year of age?

Essentials Of Human Development

1st Edition

ISBN:9781285647357

Author:Kail

Publisher:Kail

Chapter2: Biological Foundations: Heredity, Prenatal Development, And Birth

Section2.2: From Conception To Birth

Problem 7TY

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Watch this video (http://openstaxcollege.org/l/newreflex) to learn more about newborn reflexes.Newborns have a set of reflexes that are expected to havebeen crucial to survival before the modern age. Thesereflexes disappear as the baby grows, as some of themmay be unnecessary as they age. The video demonstrates areflex called the Babinski reflex, in which the foot flexesdorsally and the toes splay out when the sole of the footis lightly scratched. This is normal for newborns, but it isa sign of reduced myelination of the spinal tract in adults.Why would this reflex be a problem for an adult?
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