INBDE (Integrated National Board Dental Examination) Practice Exam

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What are the symptoms of a stroke to the right motor cortex?

  1. Lower bilateral muscles work normally, upper muscles on right side are weak

  2. Upper bilateral muscles work normally, lower muscles on left side are weak

  3. All muscles on the right side are weak

  4. All muscles on the left side are weak

The correct answer is: Upper bilateral muscles work normally, lower muscles on left side are weak

Strokes can affect different parts of the brain, so the symptoms can vary depending on the location of the stroke. In this case, the right motor cortex is responsible for controlling movement on the left side of the body. Therefore, the correct answer is B because the upper muscles on both sides work normally, while the lower muscles on the left side are weak due to the damage to the right motor cortex. The other options are incorrect because they either mention weakness in all muscles on one side of the body (C and D), or they describe a combination of weakness on both sides (A). It is important to note that other symptoms of a stroke to the right motor cortex may include sensory deficits and coordination and balance issues on the left side of the body as well.

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