What reflex occurs in response to stroking the lateral aspect of the foot's plantar surface?

• A. Moro reflex
• B. Palmar grasp reflex
• C. Asymmetric tonic neck reflex
• D. Babinski reflex

Answer: (D)

The reflex that occurs in response to stroking the lateral aspect of the foot's plantar surface is known as the Babinski reflex. This reflex is characterized by an upward movement of the big toe and a fanning out of the other toes in infants. It is a natural response that typically indicates the proper functioning of the central nervous system and is particularly significant in assessing neurological development in young children.

The Babinski reflex is commonly observed in infants up to about 2 years of age, at which point it usually disappears as the child matures both neurologically and physically. The persistence or re-emergence of this reflex in older children or adults may indicate neurological issues, as it is a sign of an immature nervous system when observed in infants.

In contrast, the Moro reflex is a startle reflex seen in infants, the palmar grasp reflex is the involuntary grasping that occurs when something touches the palm, and the asymmetric tonic neck reflex is a response where the arm and leg on one side of the body extend while the opposite arm and leg flex when the head is turned to one side. Each of these reflexes serves different developmental functions and appears at different stages in infancy.