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Mammary Gland – Structure, Function and Diseases

The mammary gland is a glandular organ of the female breast responsible for milk production. It is influenced by hormones and can be affected by various diseases.

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Things worth knowing about "Mammary Gland"

The mammary gland is a glandular organ of the female breast responsible for milk production. It is influenced by hormones and can be affected by various diseases.

What is the Mammary Gland?

The mammary gland (Latin: mamma) is a glandular organ located on the anterior chest wall in women. It consists of glandular tissue, fatty tissue, and connective tissue and is responsible for producing and releasing breast milk after childbirth. Men also possess a rudimentary mammary gland, which is typically not functionally active.

Structure of the Mammary Gland

The mammary gland is composed of several key structures:

Lobes (Lobi): The mammary gland consists of 15 to 20 individual lobes arranged radially around the nipple.
Milk ducts (Ductus lactiferi): These channels transport the produced milk to the nipple.
Nipple (Papilla mammae) and areola: The central outlet for milk, surrounded by pigmented skin.
Fat and connective tissue: Embedded between the glandular tissue, largely determining the shape and size of the breast.

Functions of the Mammary Gland

The primary function of the mammary gland is lactation -- the production and release of milk following pregnancy. Milk production is stimulated by the hormone prolactin, while oxytocin triggers the release of milk during breastfeeding. Outside of the breastfeeding period, mammary gland tissue undergoes cyclic hormonal changes driven by estrogen and progesterone.

Hormonal Influences

The mammary gland is highly sensitive to hormonal fluctuations. The key hormones involved include:

Estrogen: Promotes the growth of milk ducts and glandular tissue.
Progesterone: Stimulates the development of glandular alveoli.
Prolactin: Initiates milk production after birth.
Oxytocin: Triggers milk ejection during breastfeeding.

Common Diseases of the Mammary Gland

Mastitis (Breast Inflammation)

Mastitis is an inflammation of the breast tissue that most commonly occurs during breastfeeding. Symptoms include redness, swelling, pain, and warmth in the affected breast, often accompanied by fever.

Fibrocystic Breast Changes (Mastopathy)

Mastopathy refers to benign, nodular, or cystic changes in breast tissue, often caused by hormonal fluctuations. It typically presents as breast pain and a feeling of tightness, particularly before menstruation.

Breast Cancer (Mammary Carcinoma)

Breast cancer is the most common cancer in women. Risk factors include genetic predisposition (e.g., BRCA1/BRCA2 mutations), hormonal influences, obesity, and lifestyle factors. Early detection methods such as mammography screening allow for timely diagnosis and treatment.

Cysts and Fibroadenomas

Cysts are fluid-filled cavities within breast tissue and are generally benign. Fibroadenomas are benign tumors composed of glandular and connective tissue, occurring most frequently in younger women.

Diagnosis of Mammary Gland Conditions

Several diagnostic methods are available for examining the mammary gland:

Physical examination (palpation): Self-examination and clinical examination to detect changes in breast tissue.
Mammography: An X-ray examination of the breast, primarily used for early detection of breast cancer.
Ultrasound (sonography): Supplementary imaging used to distinguish between solid and cystic lesions.
Breast MRI: Magnetic resonance imaging for detailed soft-tissue visualization, especially in high-risk patients.
Biopsy: Tissue sampling for histological (microscopic) analysis in cases of unclear findings.

Prevention and Early Detection

Regular breast self-examination and participation in national mammography screening programs are key tools for early detection. A healthy lifestyle -- including a balanced diet, regular physical activity, and avoiding alcohol and tobacco -- can help reduce the risk of breast disease.

References

World Health Organization (WHO): Breast Cancer. Geneva, 2023. Available at: https://www.who.int/news-room/fact-sheets/detail/breast-cancer
American Cancer Society: Breast Cancer Early Detection and Diagnosis. Atlanta, 2022.
Drake RL, Vogl AW, Mitchell AWM: Gray's Anatomy for Students. 4th ed. Elsevier, Philadelphia, 2019.

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