Which reflex involves the flexion of neck muscles causing hip extension, particularly from a supine position?

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

Answer: (B)

The symmetric tonic reflex is characterized by the coordinated movement of the head and neck in relation to the limbs. When the neck extends or flexes, it triggers specific responses in the arms and legs. In the case of flexion of the neck muscles, which occurs in a supine position, this reflex results in the extension of the hips. This is significant in motor development as it helps to facilitate the ability to transition from lying down to sitting up, enabling more complex movement patterns as the child grows. This reflex is crucial for both motor learning and the development of spatial awareness, as it lays the foundation for later skills in crawling and walking. Understanding this reflex helps occupational therapy assistants assess and support children's developmental progress effectively.