AST Surgical Technologist Practice Exam

A brain tumor causing alteration of muscle tone and voluntary muscle coordination is likely located in which part of the brain?

1. Cerebrum

2. Cerebellum

3. Brainstem

4. Limbic system

The correct answer is: Cerebellum

The cerebellum is the part of the brain primarily responsible for the coordination of voluntary muscle movements and the regulation of muscle tone. When a brain tumor affects the cerebellum, it can lead to significant disturbances in balance, posture, and the ability to perform smooth and coordinated movements. This is particularly evident in actions that require fine motor skills, as the cerebellum plays a crucial role in timing and precision. Additionally, the cerebellum processes sensory information and adjusts motor commands to ensure fluid motion, which means that interference from a tumor can result in problems such as ataxia, tremors, or difficulty in maintaining muscle tone. This symptomatology aligns with the described alteration of muscle tone and voluntary muscle coordination. In contrast, while the cerebrum is involved in higher cognitive functions and voluntary motor control, it does not primarily manage coordination and muscle tone. The brainstem is involved in basic life functions, such as heartbeat and breathing regulation but is not mainly responsible for muscle coordination. The limbic system relates more to emotions, memory, and behavior rather than direct control of muscle movements.