Fetal Development - USMLE Rx - FA conflict (or is it?)

[Phloston]

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P. 124 of FA2012 says "genitalia have male/female characteristics" at week ten.

However, USMLE Rx states that gender can be determined, via inspection, at twenty weeks.

Does this mean that despite the male/female characteristics appearing at week 10, they can't be visualized for TEN MORE WEEKS? Or is something off here?

The following is a PrntScr from USMLE Rx:

 

[ijn]

You're really going for a 295 aren't you? 😉

Crazy dedication... I'd gloss over it and toss it in the "low yield, might be on my OB/GYN shelf exam a year from now if that" pile but I guess people have different priorities with the STEP 6 weeks away vs 6 months.

 

[Morsetlis]

There's a Step 6?

 

[VisionaryTics]

P. 124 of FA2012 says "genitalia have male/female characteristics" at week ten.

However, USMLE Rx states that gender can be determined, via inspection, at twenty weeks.

Does this mean that despite the male/female characteristics appearing at week 10, they can't be visualized for TEN MORE WEEKS? Or is something off here?

The following is a PrntScr from USMLE Rx:

Sounds like the differentiation process is rolling along at 10 weeks, but u/s sex determination isn't possible until later along in pregnancy.

Dude, just take the ****ing exam tomorrow.

 

[ipizzy]

sexual differentiation is completed by week 20, but there are phenotypic differences between the genders much earlier than that.

weeks 1-6: indifferent gonads (male and female fetuses look exactly the same; no internal or external genitalia yet)
weeks 8-15: differentiation and development of external genitalia
by week 20: sexual differentiation (internal and external) is complete

 

[msbbc833]

Stop making threads

 

[johndoe3344]

There's a Step 6?

 

[Phloston]

sexual differentiation is completed by week 20, but there are phenotypic differences between the genders much earlier than that.

weeks 1-6: indifferent gonads (male and female fetuses look exactly the same; no internal or external genitalia yet)
weeks 8-15: differentiation and development of external genitalia
by week 20: sexual differentiation (internal and external) is complete

Thanks so much! That's great info.

Stop making threads

Stop reading my threads.