Write a note on the structure of mammary glands.

(N/A) The mammary gland is a characteristic feature of all female mammals and is a modified sweat gland.
It is a paired structure located on the pectoralis major muscles.
Each breast contains glandular tissue and a variable amount of fat.
Externally,each breast is a raised structure with a nipple in the center,surrounded by a pigmented area called the areola.
The glandular tissue of each breast is divided into $15-20$ mammary lobes,which contain clusters of cells called alveoli.
The cells of the alveoli secrete milk,which is stored in the cavities (lumens) of the alveoli.
The alveoli open into mammary tubules.
The tubules of each lobe join to form a mammary duct.
Several mammary ducts join to form a wider mammary ampulla,which is connected to the lactiferous duct through which milk is sucked out.