What is the name of the darkened circular area surrounding the nipple that contains Montgomery's glands?

The darkened circular area surrounding the nipple is known as the areola. It is a pigmented region that is significant in both anatomy and function. The areola contains Montgomery's glands, which are small sebaceous glands that produce an oily secretion. This secretion helps to lubricate and protect the nipple area, especially during breastfeeding. The areola also has a rich supply of blood vessels and nerve endings, making it sensitive to touch and other stimuli, which can aid in the breastfeeding process.

The other terms listed do not accurately describe this specific anatomical feature. The nipple refers to the protruding part from which milk is delivered, the retromammary space is the area between the breast tissue and the underlying muscle, while the adipose layer refers to the fatty tissue beneath the skin and other structures in the breast. None of these alternatives encompass the specific characteristics and functions associated with the areola.