Certified Lactation Specialist Lactation Specialist Anatomy & Physiology of Lactation 2 — Questions and Answers
Question 1: What is the primary function of the Montgomery glands (tubercles) on the areola?
- Direct secretion of milk to supplement nipple output
- Producing sebaceous secretions that lubricate and protect the nipple-areola complex (Correct answer)
- Detecting suckling pressure and signaling prolactin release
- Releasing oxytocin locally during breastfeeding
Correct answer: Producing sebaceous secretions that lubricate and protect the nipple-areola complex
Montgomery glands are modified sebaceous glands that secrete a lubricating, antimicrobial fluid to protect the nipple-areola complex during lactation.
Question 2: Which cells surround the alveoli and contract to expel milk into the ducts during let-down?
- Lactocytes
- Myoepithelial cells (Correct answer)
- Plasma cells
- Dendritic cells
Correct answer: Myoepithelial cells
Myoepithelial cells have smooth muscle-like contractile properties and squeeze the alveoli in response to oxytocin, propelling milk into the lactiferous ducts.
Question 3: The Feedback Inhibitor of Lactation (FIL) is best described as:
- A pituitary hormone that lowers prolactin when the infant is not nursing
- A whey protein in milk that locally suppresses milk synthesis when milk accumulates in the breast (Correct answer)
- A hypothalamic peptide that reduces oxytocin release during stress
- An enzyme that degrades prolactin receptors on lactocytes
Correct answer: A whey protein in milk that locally suppresses milk synthesis when milk accumulates in the breast
FIL is a locally acting whey protein that provides autocrine control of milk production, slowing synthesis when milk is not removed — explaining why infrequent feeding reduces supply.
Question 4: Prolactin is secreted by which endocrine structure?
- Posterior pituitary (neurohypophysis)
- Hypothalamus
- Anterior pituitary (adenohypophysis) (Correct answer)
- Adrenal cortex
Correct answer: Anterior pituitary (adenohypophysis)
The anterior pituitary secretes prolactin in response to suckling stimuli and the reduction of dopaminergic inhibition from the hypothalamus.
Question 5: How does colostrum differ most significantly from mature breast milk?
- Colostrum has a much higher fat content than mature milk
- Colostrum contains higher concentrations of immunoglobulins (especially sIgA) and is produced in smaller volumes (Correct answer)
- Colostrum lacks lactose and protein compared to mature milk
- Colostrum is produced by a different population of cells than mature milk
Correct answer: Colostrum contains higher concentrations of immunoglobulins (especially sIgA) and is produced in smaller volumes
Colostrum is a low-volume, highly concentrated secretion rich in secretory IgA and immune factors, ideally suited to protect the newborn's immature immune system.
Question 6: Which of the following best describes the alveoli of the lactating breast?
- Cartilage-lined chambers that act as milk reservoirs between feedings
- Grape-like clusters of secretory lactocytes surrounded by myoepithelial cells that produce and temporarily store milk (Correct answer)
- Fibrous ligaments that provide structural support to the breast
- Lymphatic channels that drain immune cells into the milk
Correct answer: Grape-like clusters of secretory lactocytes surrounded by myoepithelial cells that produce and temporarily store milk
Alveoli are the functional secretory units of the lactating breast, organized in grape-like clusters within lobules, where lactocytes synthesize milk and myoepithelial cells contract to release it.
Question 7: Lactogenesis I (mammogenesis differentiation phase) begins at approximately what point?
- At the moment of placental delivery
- Mid-pregnancy around 16-22 weeks gestation (Correct answer)
- During the first infant feeding after birth
- At the onset of the third trimester
Correct answer: Mid-pregnancy around 16-22 weeks gestation
Lactogenesis I begins around 16-22 weeks gestation when alveolar cells differentiate and begin producing small amounts of colostrum under hormonal influence.
Certified Lactation Specialist Lactation Specialist Anatomy & Physiology of Lactation 2
What is the primary function of the Montgomery glands (tubercles) on the areola?