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RE: Sex Differences: Do females and males have different brains?
No they don't both have a penis! The female is actually the default, and if there's an SRY and some other things, then testes develop, which produce testosterone, and then the whole masculanization procedure ensues. I talked more about this in my earlier posts in this series.
You're right there are no two identical brains, and averaging them into 'male' vs 'female' might be doing them a disservice: individual differences is where things probably get much more interesting.
friend, just read a book of gestation and you will see that effectively until 4 months of embryonic development have a penis, hence the clitoris is a stunted penis.
Your textbook must be old! Or maybe from a country with a different view on the matter?
I kinda want to agree with you, because I had the same idea in the past, and because visually it does look a bit like that, especially given that the genitals are swollen during those stages, which makes them look more male. But scientists currently don't view it like that. I'm assuming you're talking about something like the genital tubercle.
I mean, to me, from experience, the clitoris does kinda look and kinda function like a tiny penis to be honest! But, like I said, scientists don't express it that way, they don't consider females to have tiny penises that then atrophy.
This is the received view I was talking about: https://www.whattoexpect.com/pregnancy/fetal-development/fetal-sex-organs-reproductive-system/
And also this (we all begin as females, and then those with the Y chromosome become males): https://www.sciencealert.com/watch-we-were-once-all-female