Which zone contains about 70% of the glandular tissue?

Which zone contains about 70% of the glandular tissue?

• A. Central
• B. Peripheral
• C. Transitional
• D. Fibromuscular

Answer: (B)

Glandular tissue in the breast is not evenly spread; it’s arranged in lobes that radiate outward from the nipple. The outer, peripheral portion contains most of these lobes and ducts, so the majority of glandular parenchyma resides there. That’s why about 70% of the glandular tissue is in the peripheral zone. The central zone around the nipple hosts the subareolar ductal system and has less parenchyma, while the transitional zone lies between central and peripheral and contains less glandular tissue. The fibromuscular zone is mainly connective tissue and muscle, not glandular tissue.

Glandular tissue in the breast is not evenly spread; it’s arranged in lobes that radiate outward from the nipple. The outer, peripheral portion contains most of these lobes and ducts, so the majority of glandular parenchyma resides there. That’s why about 70% of the glandular tissue is in the peripheral zone. The central zone around the nipple hosts the subareolar ductal system and has less parenchyma, while the transitional zone lies between central and peripheral and contains less glandular tissue. The fibromuscular zone is mainly connective tissue and muscle, not glandular tissue.