What reflex is characterized by difficulty in flexing the head in a supine position due to extensor tone?

• A. Symmetric tonic
• B. Tonic labyrinth prone
• C. Tonic labyrinth supine
• D. Asymmetric tonic

Answer: (C)

The reflex characterized by difficulty in flexing the head while in a supine position due to extensor tone is indeed the tonic labyrinthine reflex in the supine position. This reflex predominantly affects a person's ability to flex their head due to the extensor tone that is present when lying on the back.

In the tonic labyrinthine supine reflex, when a child is laid down on their back, the body's instinctive response is to extend the limbs and maintain head extension. Therefore, when attempting to flex the head, the increased tone in the extensors can hinder this motion, ultimately impacting functions such as rolling over or sitting up.

Understanding this reflex is essential for occupational therapy, as it plays a significant role in motor development and can help inform interventions for children with developmental delays. By recognizing the implications of the tonic labyrinthine supine reflex, occupational therapy practitioners can develop appropriate strategies to facilitate movement and support functional independence in their clients.