Physical Therapy Assistant Practice Exam

What reflex is characterized by the body and extremities being in flexion when an infant is placed in a prone position?

1. Symmetrical tonic neck reflex

2. Tonic labyrinthine reflex

3. Crossed extension reflex

4. D1 flexion pattern

The correct answer is: Tonic labyrinthine reflex

The tonic labyrinthine reflex is a critical reflex observed in infants, particularly relating to their response when placed in a prone position. This reflex involves the body's reaction to changes in the position of the head concerning gravity. When an infant is placed face down (prone), the tonic labyrinthine reflex triggers a generalized flexion response of the body and extremities. This is a natural protective mechanism that helps the infant maintain stability and coordination as they adapt to their environment. The reflex indicates that the infant is developing the necessary motor patterns and neurological pathways to support postural control and movement. It is important for laying the groundwork for more complex motor skills that will emerge as the child grows. Understanding such foundational reflexes is essential for physical therapy assistants, as they often work with developing children to support their physical growth and ensure that they reach their developmental milestones.