Physical Therapy Assistant Practice Exam

At what age does the symmetrical tonic neck reflex typically integrate in infants?

1. 6 months

2. 12 months

3. 2 months

4. 1 year

The correct answer is: 6 months

The symmetrical tonic neck reflex (STNR) is a crucial developmental reflex observed in infants, primarily related to the coordination of head and neck movement with the limbs. This reflex typically integrates around 6 months of age. At this age, infants begin to develop more purposeful movement patterns. The presence of the STNR facilitates the transition from a prone position to crawling, which is significant for motor development. The reflex helps the child learn to coordinate their movements, as the extension of the neck corresponds with the extension of the arms, while the flexion of the neck leads to the flexion of the legs. Integration of the STNR by about 6 months indicates that the infant is moving toward more complex movement abilities and body awareness, which are essential for the next stages of development. Understanding this timeline helps physical therapy assistants recognize normal developmental milestones and identify potential delays in motor skills.