Nipple inversion occurs due to involvement of
Mastitis in many cases the lactiferous ducts will first become blocked by epithelial debris leading to stasis; this theory is suppoed by the relatively high incidence of mastitis in women with a retracted nipple.Periductal fibrosis is a sequela of periductal mastitis and may result in nipple retraction.Schwaz surgery 15th edition pg: 509
Cooper ligament
Subareolar duct
Parenchyma of breast
Subdermal lymphatics
Endocrinology and breast