Praxis SLP Licensure Exam

Which central nervous system structure is likely impaired in a person experiencing ataxia?

1. Midbrain

2. Pons

3. Medulla

4. Cerebellum

The correct answer is: Cerebellum

Ataxia is a condition characterized by a lack of voluntary coordination of muscle movements, often resulting in unsteady or uncoordinated movements. The cerebellum plays a crucial role in coordinating motor control and maintaining balance and posture. Therefore, when there is impairment in the cerebellum, it directly affects the ability to perform smooth and accurate movements, leading to the symptoms associated with ataxia. The cerebellum integrates sensory information to fine-tune and adjust motor commands, which is essential for fluid, precise movements. If the cerebellum is compromised, the individual may experience difficulties such as imbalances, clumsiness, and an overall disruption in coordination. While other structures in the central nervous system, such as the midbrain, pons, and medulla, play roles in various motor and sensory functions, they are not primarily responsible for the coordination of movement and balance, which are specifically associated with cerebellar function. Hence, in the context of ataxia, the cerebellum is the most critical structure that is likely to be impaired.