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乳腺正常时内结缔组织分隔为15～20个小叶．每个小叶是一个复管泡状腺，腺泡逐级汇合为小叶内导管、小叶间导管、总导管。腺泡上皮为单层立方或柱状上皮，小叶间导管为复层往状上皮·上皮基底面均为基膜，在上皮和基膜之间有肌上皮细胞（myoepithelialcell）[1]。乳腺组织在单
When the breast is normal, the connective tissue is divided into 15 to 20 leaflets. Each leaflet is a complex vesicular gland that progressively merges into a lobular duct, an interlobular duct, and a common duct. The acinar epithelium is a single-layered cubic or columnar epithelium. The interlobular ducts are complex layers of degenerated epithelial and epithelial basal surfaces are basement membranes. There are myoepithelial cells between the epithelium and basement membrane [1]. Breast tissue in single