milk lines formed by thickening of epidermis (mammary ridge) along the ventral surface of mammals of both sexes, these lines extend on both side from upper limb to lower limb, sometime upto legs. Milk lines frist appear in 7 week of embryonic life and fade away in 9th week in inframammary area, breast devolops along this line.
1915 kajava published the classification for supernumerary breast anomalies. Class 1 complete breast(areola,nipple and glandular tisue) Class 2 presence of nipple and glandular tissue, no areola Class 3 areola and glandular tissue ,no nipple Class 4 glandular tissue is present Class 5 nipple and areola Class 6 nipples only present(polythelia) Class 7 areola only (polythelia areolaris) Class 8 patch of hair only present(polythelia pilosa) Most common anomaly is polythelia, followed by polymastia, these anomalies occures in 2 to 6 % in females and 1 to 3% in males,…
