Endoscope image of the human foetus in the womb after approximately 10-12 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. Blood vessels are visible through the translucent skin of the surrounding limbs.
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