The morpho-functional unit of the breast is composed of:
a. The aveoli and the large duct system
b. The lobule and the stroma
c. The lactiferous sinus and the terminal ductules
d. The TDLU (terminal duct lobular unit) and the large duct system
The Correct option is D
Explanation with High Yield Facts:
The morpho-functional unit of the breast is composed of two units
- Terminal duct lobular unit (TDLU)
- consists of lobules and smaller terminal ductules
- together empty into the segmental duct, then the lactiferous sinus, then the collecting duct
- Large collecting ducts
- Most of the breast stroma consists a loose connective tissue, adipose tissue, elastic fibers that support the larger ducts (interlobular stroma)
- However each lobule is surrounded by the intralobular stroma (hormonal responsive stroma)
- Blood supply of the breast is predominantly from the internal mammary artery and lateral thoracic artery
- Lymphatic drainage is a valveless unidirectional flow from superficial to deep
- Majority of lymphatic drainage is to axillary nodes, 97%
- 3% going to internal mammary chain
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