Final answer:
The elevated sebaceous glands located in the areolas are called Montgomery glands. They secrete oil to cleanse the nipple opening and prevent chapping and cracking of the nipple during breastfeeding.
Step-by-step explanation:
The elevated sebaceous glands located in the areolas are called Montgomery glands. These glands are specialized sebaceous glands that play a crucial role in the breast, particularly during breastfeeding. They produce an oily secretion that helps to lubricate and protect the skin of the areola and nipple, which is especially important to prevent chapping and cracking during breastfeeding. Sebaceous glands are holocrine glands that secrete oils to lubricate and protect the skin, and new glandular cells form to replace the ones that are lost after releasing their contents.