Nipple: The nipple is a lifted framework located in the middle of your breast. It has smaller muscles that agreement in reaction to stimulation. When the breasts are stimulated with the suckling of her child, the mother's brain secretes oxytocin. Higher amounts of oxytocin cause the contraction of muscle cells https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb