INBDE (Integrated National Board Dental Examination) Practice Exam

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The brachial plexus is formed from the anterior/ventral rami of which vertebral levels?

  1. C1 to C4

  2. C5 to T1

  3. C3 to C5

  4. T1 to T4

The correct answer is: C5 to T1

The brachial plexus is a network of nerves that originate from the anterior/ventral rami of spinal nerves C5-T1. This is why option B, C5-T1, is the correct answer. Option A, C1-C4, is incorrect because these levels do not contribute to the brachial plexus. Option C, C3-C5, also does not include the T1 spinal nerve, therefore it is incorrect. Option D, T1-T4, includes levels beyond T1 and does not include C5, making it incorrect as well.

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