faa. Development and Anomalies of Male and Female External Genitalia. Objectives: Describe and discus the development of the male urethra and the penis. Describe and discus the development of the vagina, labia majora and labia minora .
At the end of the third month, the two urethral folds close over the urethral plate, forming the penile urethra.
A. Development of external genitalia in the male at 10 weeks. Note the deep urethral groove flanked by the urethral folds. B. Transverse sections through the phallus during formation of the penile urethra. The urogenital groove is bridged by the urethral folds. C. Development of the glandular portion of the penile urethra. D. Newborn.
A. Hypospadias showing the various locations of abnormal urethral orifices.
A. In utero photograph of the genitalia of a male fetus at 12 weeks. Note that the urethral folds are fusing and that the scrotal swellings are enlarging to merge in the midline. B. Genitalia of a female fetus at 11 weeks. Note that the urethral folds, which will become the labia minora, have not fused and that the genital swellings, that are forming the labia majora, are widely separated.