A pediatric nurse is assessing the neurological development of infants at a pediatric clinic. The nurse knows that primitive reflexes must disappear in a predictable sequence to allow for the development of voluntary motor skills. Arrange the following infant reflexes in the chronological order of their expected disappearance, from earliest to latest.
- 1Stepping reflex
- 2Palmar grasp reflex
- 3Moro reflex
- 4Plantar grasp reflex
- 5Babinski reflex
Answer
The correct sequence of disappearance for primitive reflexes from earliest to latest is: Stepping reflex, Palmar grasp reflex, Moro reflex, Plantar grasp reflex, and Babinski reflex.
Primitive reflexes are involuntary motor responses originating in the brainstem. As the central nervous system matures, these reflexes disappear in a predictable, cephalocaudal sequence to allow for voluntary motor development. The stepping reflex fades first (1-2 months). The palmar grasp must disappear by 3-4 months so the infant can intentionally hold objects. The Moro reflex usually resolves by 4-6 months as balance and head control improve. The plantar grasp remains until 8-10 months, prior to independent standing. Finally, the Babinski reflex disappears between 12 and 18 months as the nervous system matures and the child learns to walk independently.
Step-by-Step Solution
Key Concept
Disappearance of Primitive Infant Reflexes
Estimated Time:1m 30s