An MRI study comparing the CC of right-handed homosexual and heterosexual men found that in homosexual men the isthmus (a part of the CC between the callosal body and the splenium) is larger in size than in heterosexual men.
An MRI study comparing the CC of right-handed homosexual and heterosexual men found that all parts of the CC are larger in homosexual men. In particular, the isthmus (a part of the CC between the callosal body and the splenium) is significantly larger in size in homosexual than heterosexual men.