At what week of embryonic development does the differentiation of the external genitalia begin?

• A. Week 11
• B. Week 9
• C. Week 5
• D. Week 7

Answer: (D)

Verified step by step guidance

1. Understand that embryonic development is a complex process where different structures form at specific times.
2. Recognize that the differentiation of external genitalia is part of the sexual differentiation process in embryos.
3. Know that sexual differentiation begins with the development of the gonads, which occurs earlier in embryonic development.
4. Identify that the differentiation of external genitalia specifically begins around the 7th week of embryonic development.
5. Remember that by the 12th week, the external genitalia are typically more distinctly male or female, but the initial differentiation starts at week 7.