part_of part of part of only in taxon only_in_taxon develops_from develops from has potential to develop into has potential to develop into anatomical entity anatomical entity Amniota 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. todo - add taxon constraints undifferentiated genital tubercle EHDAA:5925 EHDAA2:0000705 GT development is indistinguishable in male and female mouse embryos until approximately E16, when the urethral plate begins to be masculinized to form the penile urethra, marking the beginning of an androgen-dependent phase of sexual differentiation[MP:0011771] In mammalian embryos, male and female external genitalia develop from the genital tubercle.[well established][VHOG] tuberculum phallicum tuberculum genitale The eminence in the embryo which develops into the clitoris or penis. [TFD][VHOG] VHOG:0000583 genital tubercle Wikipedia:Genital_tubercle FMA:302888 SCTID:308798005 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; GT development is indistinguishable in male and female mouse embryos until ~E16, when the urethral plate begins to be masculinized to form the penile urethra, marking the beginning of an androgen-dependent phase of sexual differentiation[MP] phallic tubercle uberon we assume the EMAPA class is the undifferentiated form based on TS timings EMAPA:17382 UBERON:0005876 All amniotes studied to date initiate external genital development with the formation of paired genital swellings. In mammals, archosaurs, and turtles, these swellings merge to form a single genital tubercle, the precursor of the penis and clitoris[PMID:24960313] indifferent external genitalia differentiated genital tubercle