In humans, mammary gland is divided into ______lobes.

The correct option is 15– 20.

Step-by-step Explanation:

1. In human anatomy, the female breasts contain mammary glands, which are modified sweat glands responsible for lactation (milk production).
2. Externally, the breast features a projecting nipple surrounded by a circular pigmented area called the areola.
3. Internally, the glandular tissue of each mammary gland is divided anatomically into 15 to 20 distinct compartments called mammary lobes.
4. These lobes are separated from one another by adipose (fatty) tissue and connective tissue strands called suspensory ligaments (or Cooper's ligaments), which support the breast structure.
5. Within each lobe, there are smaller clusters of cells called alveoli, which secrete milk. The milk travels from the alveoli through mammary tubules into mammary ducts, eventually joining at a wider mammary ampulla connected to a lactiferous duct, which opens at the nipple.

Therefore, the mammary gland is divided into 15– 20 lobes.