The urogenital folds are an embryological structure which give rise to a portion of the external genitalia. In the female, the urogenital folds become the labia minora while in the male they form the urethra and a portion of the shaft of the penis, not including the glans.
In the male, failure of the urogenital folds to fuse during development leads to a condition known as hypospadias.
The uterovaginal primordium invaginates the dorsal surface of the urogenital sinus to become the epithelium and glands of the uterus.
The urogenitalfolds and labioscrotal swellings do not fuse across the midline and remain to form the labia minora and majora.
In the male testosterone promotes elongation of the phallus into the penis and the urogenitalfolds fuse and cause the urethra to be incorporated into the corpus spongiosum, with the urethral orifice at the glanspenis.
The urogenital sinus gives rise to: 1) the bladder in both sexes; 2) the membranous (= entire) urethra in females, and the membranous and prostatic urethra in males; 3) the vestibule of the vagina in females and the penile urethra in males.
As this occurs, the urogenitalfolds develop and form the lateral walls of the urethral groove of the ventral surface of the penis.
The phallus regresses to become the clitoris, the urogenitalfolds become the labia minora, and the labioscrotal folds become the labia majora.
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