ABSTRACT
EMBRYOLOGY 1. Which one of the following statements is correct regarding fetal breast tissue
development? A. The milk ridge develops in the third week and extends from the fifth rib to the groin. B. The lactiferous ducts develop from cutaneous epithelium beginning in week 8. C. Polymastia can occur anywhere along the milk ridge but most commonly occurs on the
right at the level of the inframammary crease. D. Polythelia is the second most common congenital breast abnormality, occurring in 0.5% to
1% of the population. E. The lactiferous ducts develop early in fetal development, but the areolae are rarely present
before the seventh month.
