Attached Link: http://www.vh.org/adult/provider/anatomy/AnatomicVariants/OrganSystem/Text/MammaryGland.html

"Extras" can appear in many locations, some of them dowmright weird. Check out the images if you're curious. "The usual position of the accessory mammae is below and somewhat medial to the usual glands and corresponds to the mammary line in other animals. In some cases, they may be found above and laterally, in the axillary region, especially in Japanese subjects. The number of accessory or supernumerary glands varies: three pairs in one case, five milk-secreting organs in another, and eight glands in both sexes (1-2% of females and males) have been recorded. They are often asymmetrically placed and not uniformly developed. Comparative studies of the mammae in "lower animals" and the disposition of the supernumerary organs in the human subject suggest the probability that remote human ancestors normally possessed more than two glands; the occasional occurrence of the variant mammae in positions anticipated by the milk-ridges, rudimentary organs sometimes occupy very unusual locations, including the back, lateral thorax, neck, shoulder, inner aspect of the arm, axilla, buttocks, hip, thigh and labium majus." - Bergman, Afifi & Miyauchi

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