Which of the following reflexes in a newborn does not serve a known purpose?
A) rooting
B) Babinski
C) grasping
D) Moro

Question

Quizplus · Accepted Answer

The Babinski reflex, also known as the plantar reflex, is a response where the big toe extends upward and the other toes fan out when the sole of the foot is firmly stroked. This reflex is normal in infants and usually disappears by the age of 12 to 24 months as the nervous system matures. In adults, a positive Babinski reflex can indicate neurological problems, as it is not typically present in healthy adults. While the reflex is a sign of normal development in infants, its specific purpose is not well understood, unlike the other reflexes listed which have clear survival or developmental functions.
Here's a brief explanation of the purpose of the other reflexes listed:
a) Rooting: This reflex helps a newborn find the breast or bottle to begin feeding. When the corner of the baby's mouth is stroked or touched, the baby will turn their head and open their mouth to follow and "root" in the direction of the stroking. This helps the baby find the nipple and begin feeding.
c) Grasping: The grasping reflex, also known as the palmar grasp, occurs when an object is placed in the infant's hand and the palm is stroked, causing the baby to close their fingers and grasp the object. This reflex is thought to be a primitive one, originating from a time when infants needed to hold onto their mothers for support.
d) Moro: The Moro reflex, or startle reflex, is an involuntary response to a sudden stimulus or perceived threat, such as a loud noise or a sensation of falling. The baby will throw back their head, extend out their arms and legs, cry, and then pull the arms and legs back in. This reflex is believed to be a protective response and is an indicator of proper neurological development.

Which of the Following Reflexes in a Newborn Does Not