Breast changes during menstrual cycle, illustration 插畫檔

Illustration showing the physiological changes in breast tissue throughout the menstrual cycle. Progressing from left to right, the image sequentially showing the morphological alterations of mammary ducts and acini across different phases. During the early cycle, ductal epithelial cells are uniformly arranged within a dense stroma. As the cycle advances, acinar proliferation occurs with luminal dilation, while epithelial cells hypertrophy and display intracytoplasmic secretory granules. In the secretory phase, the acini are markedly enlarged with lumens filled with secretions, accompanied by pronounced stromal oedema