Zoe Ellen Brain
Jul 20, 2017 · 1 min read

Thank you for the URL. One to add to my collection of evidence.

What appears to me to be important is not the cerebral cortex as a whole, but which specific parts have what morphology.

Too much is neuroplastic, and varies with both environment and hormonal millieu to talk about “whole brain” sexual dimorphism.

See for example:
http://www.eje-online.org/content/155/suppl_1/S107.full

Changing your sex changes your brain: influences of testosterone and estrogen on adult human brain structure by Pol et al, Europ Jnl Endocrinology, Vol 155, suppl_1, S107-S114 2006

Strict binary models are of limited usefulness too.

Sexual differentiation of the human brain in relation to gender identity and sexual orientation D.Swaab & A.Garcia-Fulgaras Functional Neurology, Jan-Mar 2009:

One person we studied had untreated male gender dysphoria (S7), took no hormones and kept his transsexual feelings under wraps. He appeared to have a large INAH3 volume — in the male range — but a female INAH3 number of neurons (68) and a female BSTc somatostatin neuron number (95). Hence, this individual’s hypothalamic characteristics were mid-way between male and female values

Yet.. some structures are invariant, and sexually dimorphic.

Male–to–female transsexuals have female neuron numbers in a limbic nucleus. Kruiver et al J Clin Endocrinol Metab (2000) 85:2034–2041

The present findings of somatostatin neuronal sex differences in the BSTc and its sex reversal in the transsexual brain clearly support the paradigm that in transsexuals sexual differentiation of the brain and genitals may go into opposite directions

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    Zoe Ellen Brain

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