Final answer:
The upper cervical region can affect muscles in the arms, chest, and legs in case of a spinal injury.
Explanation:
The muscle groups that would be affected if a spinal injury occurred in the upper cervical region include:
- Arms: The upper cervical region controls the nerves that innervate the muscles in the arms and hands.
- Chest: Although not directly mentioned in the provided text, the upper cervical region also plays a role in controlling some chest muscles.
- Legs: The upper cervical region itself does not directly innervate the leg muscles, but spinal injuries at this level can have cascading effects on the lower body due to the interconnectedness of the spinal cord segments.
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