Editing Plantar reflex (section)

===In infants===
{{main|Primitive reflexes}}
[[Infant]]s will usually show an extensor response. In one study of 256 healthy infants, the response to testing was extensor in 73.8%, flexor in 8.9%, and equivocal in 17.3%<ref>{{cite journal|last1=Gupta|first1=A|last2=Gupta|first2=Piyush|title=Neonatal plantar response revisited |journal=Journal of Paediatrics and Child Health|date=July 2003|volume=39|issue=5|pages=349–351|doi=10.1046/j.1440-1754.2003.00172.x|pmid=12887664|s2cid=19382928}}</ref> This extensor response occurs because the [[corticospinal tract|corticospinal pathways]] that run from the [[Human brain|brain]] down the [[spinal cord]] are not fully [[myelin]]ated at this age, so the reflex is not inhibited by the [[cerebral cortex]]. The extensor response usually disappears – giving way to the flexor response – by 12 months of age.<ref>{{cite web|title=Neonatal reflexes|url=http://www.healthofchildren.com/N-O/Neonatal-Reflexes.html|access-date=24 May 2017}}</ref> Its persistence beyond age 2–3 indicates a problem in the brain or spinal cord.<ref>{{cite web|title=Medline plus: Babinski reflex|url=https://medlineplus.gov/ency/article/003294.htm|access-date=24 May 2017}}</ref><ref>{{cite journal|last1=Neelon|first1=Francis A|last2=Harvey|first2=Elisabeth|title=The Babinski Sign|journal=N Engl J Med|volume=340|issue=3|pages=196|date=January 21, 1999|doi=10.1056/NEJM199901213400305|pmid=9895399}}</ref>