Nipple: The nipple can be a lifted structure located in the center on the breast. It contains little muscles that contract in reaction to stimulation. ) In pregnancy the areola darkens more and spreads in measurement. The areola includes tiny modified sweat glands (Montgomery's glands) that secrete humidity that acts https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb