A defect in which of the following germ layers would primarily affect the development of the brain, spinal cord, and epidermis?

A Endoderm

B Mesoderm

C Ectoderm

D Neural crest

✓ Correct Answer: Option C

The ectoderm is the outermost germ layer responsible for forming the epidermis, nervous system (brain and spinal cord from the neural tube), and sensory organs. Neural crest cells are derived from the ectoderm but are a specific cell population.

💡 Why is C) the correct answer?

The correct answer to the question "A defect in which of the following germ layers would primarily affect the development of the brain, spinal cord, and epidermis?" is Option C: Ectoderm.

The other options — A) Endoderm, B) Mesoderm, D) Neural crest — are incorrect for this USMLE Exam Prep question. As explained above: The ectoderm is the outermost germ layer responsible for forming the epidermis, nervous system (brain and spinal cord from the neural tube), and sensory organs. Neural crest cells are derived from th…

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This 1-level USMLE Exam Prep question from the Step 1 – Basic Sciences topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free USMLE Exam Prep practice test or use flashcards for spaced repetition review.

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A defect in which of the following germ layers would primarily affect the development of the brain, spinal cord, and epidermis?

✓ Correct Answer: Option C

📚 About This USMLE Exam Prep Practice Question

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