Step 1: Understanding the Problem:
The mammary glands are paired structures that contain glandular tissue. This tissue synthesizes and secretes milk, which must travel through a highly organized sequence of ducts to be expelled.
Step 2: Approach and Formula:
Trace the anatomical pathway of milk flow progressively from the site of synthesis (alveoli) to the exterior point of suckling.
Step 3: Detailed Explanation:
The glandular tissue is divided into 15-20 mammary lobes per breast, containing clusters of milk-secreting cells called alveoli.
The flow of milk follows this strict sequence:
1. The cells of the alveoli synthesize and secrete milk, which accumulates in their lumens.
2. The alveoli open directly into small ducts called mammary tubules.
3. The tubules of each lobe join together to form a wider mammary duct.
4. Several mammary ducts unite to form a larger, swollen structure called the mammary ampulla.
5. The mammary ampulla is directly connected to the lactiferous duct, through which milk is finally drawn out from the nipple.
Thus, the correct path is: Alveoli $\rightarrow$ Mammary tubules $\rightarrow$ Mammary duct $\rightarrow$ Ampulla $\rightarrow$ Lactiferous ducts.
Step 4: Final Answer:
The correct option is (B).