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Dr. John Stevens, MD | Consultant Sonologist | Prenatal Diagnosis
Three pictures of sonograms of fetuses.
Photos
Baby's Anus, Buttocks, Clitoris, Labioscrotal Swelling, Leg, Urogenital FoldBaby's Anus, Buttocks, Clitoris, Labioscrotal Swelling, Leg, Urogenital Fold

Sonogram showing Female Face at 12 Weeks.

Sonogram of Normal Baby

Sonogram

Sonogram of Normal Brain at 12 Weeks.

Baby's Anus, Labioscrotal Swelling, Leg, Penis, Scrotal Raphe, Scrotum, Urethral Groove, Urogenital FoldsBaby's Anus, Labioscrotal Swelling, Leg, Penis, Scrotal Raphe, Scrotum, Urethral Groove, Urogenital Folds

Sonogram of Male at 16 Weeks

Sonogram at 12 Weeks

Sonogram

Graph of Gestational Weeks
Diagrammatic representation of the embryological process of labio-scrotal fusion.  The male fetus is shown indistinguishable for the female fetus during the 10th-12th week of gestation.  As labio-scrotal fusion occurs, the male fetus becomes increasingly identifiable as male and at the same time becoming distinguishable from the female.  This process occurs during the 12th-14th week of gestational Age.  The reported attainment of essentially 100% accuracy of F.A.S.A. becomes achievable from the 12th week of gestational age and beyond.  LM-labio-scrotal fold:  TS-testicular sac:  P-penis:  C-clitoris:  GT-genital tubercle.

Diagram of Genitalia Development

This is a schematic diagram of the accompanying Polaroid film images of the typical image showing prominent male and female genitalia patterns as imaged in scan plane #1.  The Polaroid film documentations were obtained from fetuses in the 12th week of gestation. 
TS-testicle sac:  P-penis:  C-clitoris:  LM-labia majora.

Diagram of male/female genitalia patterns

This is a schematic diagram of the accompanying Polaroid file images of the typical scans which show prominent male and female genitlia patterns as imaged in scan plan #2.  The Polaroid film documentations were obtained from fetuses in the 12th week of gestation. 
TS-testicle sac:  P-penis:  C-Clitoris.

Diagram of Fetus at 12 Weeks
This shows unconventional transducer placements on the maternal abdomen used to image a male fetus between the thighs as seen in scan plane orientation #1 and to image the fetus sagittaly through the longitudianal axis of the fetal body to obtain scan plane orientation #2.

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