<unk> s make oily secretions (lipoid fluid) to keep the<unk> and the nipple lubricated and protected. Volatile compounds in these secretions may also serve as an olfactory stimulus for newborn appetite. They can become exposed and raised when the nipple is stimulated. The skin over the surface opening is lubricated and tends to be smoother than the rest of the<unk>
Areolar gland
Skene's gland
Serous gland
Meibomian gland
Callus
Ciaccio's glands
Krause's glands
Adrenal gland