EDELMANN / SCIENCE PHOTO LIBRARY. EDELMANN / SCIENCE PHOTO LIBRARY.
Endoscope image of the human foetus in the womb after approximately 10 weeks development, showing the penis (centre). Internal sexual differentiation is accomplished during the beginning of the 3rd month of pregnancy, & the internal organs have developed sufficiently to enable to differentiate between the sexes. At this stage the external genitalia are still in the asexual stage; the primitive penis & clitoris appear the same.
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