A. Papillae
B. Glands of Montgomery
C. Acini cells
D. Lactiferous sinuses
Correct Answer: C. Acini cells
Explanation
The structures most directly involved in the production of milk are the acini cells (also called alveoli of the mammary gland).
Explanation
- Acini (alveoli) are the functional units of the breast responsible for milk production.
- They are small sac-like structures located at the ends of the mammary ducts.
- Lactocyte cells (milk-secreting epithelial cells) line the acini and synthesize milk in response to the hormone prolactin.
- The milk is then pushed into the ducts by myoepithelial cells, which contract under the influence of oxytocin.
Summary
Structure Role Acini / Alveoli Primary site of milk production Lactocyte epithelial cells Produce & secrete milk Myoepithelial cells Push milk into ducts Lactiferous ducts Transport milk to nipple
Correct Answer
👉 Acini / Alveoli (milk-producing units of breast)
Other Options Details
Here is the description of all the options:
A. Papillae
- Papillae refer to the nipple (mammary papilla) of the breast.
- It is the raised, pigmented area through which milk is ejected during breastfeeding.
- Contains openings of the lactiferous ducts, which carry milk from the mammary glands to the exterior.
- Surrounded by the areola.
B. Glands of Montgomery
- These are sebaceous glands located in the areola around the nipple.
- Also known as Montgomery tubercles.
- They secrete an oily antimicrobial fluid that lubricates and protects the nipple during lactation.
- Helps prevent cracking of the skin while breastfeeding.
C. Acini Cells
- Acini cells (also called alveoli of the breast) are the milk-secreting units of the mammary gland.
- They are the functional unit where milk is produced.
- Surrounded by myoepithelial cells, which contract under the influence of oxytocin to eject milk into the ducts.
D. Lactiferous Sinuses
- These are small dilated portions of lactiferous ducts located just beneath the nipple.
- Temporarily store milk before it flows out through the nipple.
- Expand during breastfeeding to aid milk release.
Summary
Option Structure Function Papillae Nipple Milk outlet Glands of Montgomery Sebaceous glands in areola Protect & lubricate nipple Acini Cells Milk-producing units Secretion of milk Lactiferous Sinuses Expanded ducts Temporary milk storage
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Writer: Vandita Singh, Lucknow (GS India Nursing Group)