The breasts lie on top of the chest wall and over the pectoral muscles. They contain glands, lobules, fatty tissue, and other structures. Milk ducts lead to the nipples, which are surrounded by a darker area called the areola.
Both males and females have breasts, but they are more developed in females.
Each breast contains many glands and other structures that allow them to perform their functions. Namely, the primary biological function of the breast is to produce milk to feed infants. However, the breast can also be a symbol of femininity and play a role in sexual attraction and pleasure.
Breast cancer is a type of cancer that begins in the breast. Other than skin cancer, it is the
In this article, we will explore the various components that comprise male and female breasts. It will also discuss how a person can perform a self-examination for breast cancer.
Sex and gender exist on spectrums. For the purposes of this article, we use “male” and “female” to refer to a person’s sex assigned at birth. Learn more.
The breasts are glandular organs that sit atop the chest wall and pectoral muscles. The breasts are present in both sexes. However, the female breasts are more developed. The breasts are also an important component of the female reproductive system.
When puberty occurs, the female breasts develop at an accelerated rate due to the effects of estrogen and other hormones. These result in the development of adipose (fatty) tissue that gives the female breasts their hemispherical shape, as well as the development of glandular tissue and the duct system.
The male breast structure is nearly identical to the female breast. However, they usually lack the specialized structures that allow female breasts to produce and secrete milk. In some cases, men may develop a condition known as gynecomastia. This is where the mammary glands enlarge and resemble female breasts.
In males, the breasts do not have a functional role. However, they may also enhance sexual pleasure following manipulation of the breast and nipples.
Click on the BodyMap above to interact with a 3D model of the breast.
Different structures make up the breasts, including structures underneath the skin. These structures
The chest wall
The bones that make up the chest wall include the ribs, the breastbone (which a person can feel in between the breasts), and the spine. It also helps to support breathing and the movement of the upper arms and shoulders.
- pectoralis major
- pectoralis minor
- serratus anterior
The lobules are glands that are responsible for producing milk in the breast. The lobules are in clusters and form lobes.
There are between 15–20 lobes embedded in the breasts’ fatty tissue, and they radiate around the nipple. Some breast cancers start in the lobules and are known as lobular cancers. Male breasts typically lack lobules, as they do not produce milk.
The ducts are the tubes that carry milk from the lobules to the nipple. A collection of lobules along with a duct form the terminal ductal lobular unit. There are many terminal ductal lobular units present in the breast. Most breast cancers start in the terminal ducts and are known as ductal cancers.
The mammary glands are accessory glands present in the chest with specialized functions. It is an apocrine type of gland and its main function in females is to secrete milk.
The mammary glands are predominantly located in the pectoral region of the chest. However, a part of the mammary gland, known as the axillary tail, extends to the axilla, which is the region below the armpits.
Fatty tissue, along with fibrous tissue, makes up the connective tissue that holds all the structures within the breasts in place. The fatty tissue fills the space between glandular (lobes and ducts) and fibrous (ligaments) tissue.
The fatty tissue determines the size of the breast. During puberty, increased estrogen levels stimulate the buildup of fatty tissue and glandular tissue which increases the size of the female breast.
The lymph nodes are small organs present throughout the body. The lymph nodes produce a fluid called lymph which contains lymphocytes. Lymphocytes are immune cells that fight infections and diseases. Lymph vessels transport filtered lymph fluid from the breast to the lymph nodes.
The axillary group of lymph nodes drains
The areola is the darker, pigmented, round area around the nipple. The areola has small bumps on its surface. These are sebaceous glands that release oily secretions that stop the areola and nipple from cracking.
The nipple is the raised projection in the middle of the areola. About
Breast cancer occurs when cells in the breast grow at an uncontrollable and accelerated rate. This can be due to mutations or changes in the genes that control the growth of breast cells. Breast cancer can spread to other regions of the body through the blood or lymph.
Breast cancer treatment is more likely to be successful if a person can detect the cancer early. People can self-examine their breasts regularly to increase the likelihood of early detection.
Both men and women can do similar self-examinations to check their breast health.
A person should start by first examining their breasts in a mirror with their shoulders straight and their arms on their hips. They should check that their breasts are their usual size, shape, color and that the breasts are evenly shaped.
People should look for changes such as:
- dimpling, puckering, or bulging of the skin
- changes in the position of the nipple or if the nipple is inward instead of sticking out
- a rash
Next, the person should raise both arms and look for the same changes. They should also check to see if any fluid comes out of any or both nipples.
The person should then lie down and examine their breast with their hands. To examine the left breast, a person should use their right hand and vice versa for their right breast.
They should examine the breast using a circular motion, starting at the nipple, and then fanning out in a circular motion, ensuring they reach their collarbone, upper abdomen, and the underarm region. A person should apply firm enough pressure to feel any lumps.
Lastly, the person should repeat the previous step while standing up.
If a person notices any changes, finds a lump, or experiences discharge from the nipple, they should seek advice from their primary care physician. A doctor will be able to check and order tests to ensure a correct diagnosis.
The breasts are glandular organs present in the chest area of the upper body. They consist of specialized structures, including lobules and ducts, that facilitate milk production in females and are usually non-functional in males.
Breast cancer can occur in males and females. Therefore, it is vital for people to perform regular self-examinations to check for breast cancer. This includes visually examining the breast as well as manually examining the breast in a circular motion for lumps or skin changes. Early detection may help treat possible breast cancer more successfully.