part of part of develops from has potential to develop into embryonic structure somatopleure undifferentiated genital tubercle http://upload.wikimedia.org/wikipedia/commons/d/d6/Gray1119.png The embryonic anlage of the external genitalia, which emerges as paired swellings ventral to the cloacal membrane, is proposed to be derived from all three germ layers, and gives rise to the penis, clitoris, scrotum, labia, and foreskin. undifferentiated genital tubercle genital tubercle Wikipedia:Genital_tubercle EHDAA:5925 FMA:302888 SCTID:308798005 phallic tubercle EHDAA2:0000705 EMAPA:17382 UBERON:0005876 tuberculum phallicum tuberculum genitale VHOG:0000583 indifferent external genitalia differentiated genital tubercle