Fig. 2ATopographical anatomy of vaginal atresia in a fetus with a CRL of 235 mm (sagittal sections). (A) is an almost-midsagittal section, and the five inner squares appear at higher magnification in –E; (C) is the most lateral plane and the inner square appears at higher magnification in Fig. 2F. Inserts on the left of each figure show poorly developed cavernous tissues: the CC of the clitoris, which is surrounded by the developing prepuce (top); the crus of the clitoris (middle); and the vestibular bulb (bottom). Arrows in (B) and (C) indicate an end part of a lateral recess of the closed vestibule. The clitoris is embedded in a thick subcutaneous tissue that covers and closes the vestibule, and the urethra and vagina open to the vestibule. The EAS, IAS are normal. Asterisks in (A) indicate an artifact space from the histological procedure. (A–C) were at the same magnification and the inserts were at the same magnification. Scale bar: (C) 5 mm; (bottom insert) 1 mm. CRL, crown-rump length; CC, corpus cavernosum; EAS, external anal sphincter; IAS, internal anal sphincter; BSM, bulbospongiosus muscle; GMX, gluteus maximus muscle; ICM, ischiocavernosus muscle; LAM, longitudinal anal muscle.

Anat Cell Biol 2022;55:475~482 https://doi.org/10.5115/acb.22.082

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