What is colostrum?
First milk produced by mammary glands in breast (for about a week)
Why is “breast is best” for the baby?
What does WHO/UN advise women to do regarding breast feeding?
Breast feed exclusively for 6 months for optimal lifetime benefits
Why is “breast is best” for the mother?
What is the physiology behind lactational amenorrhoea?
Describe breast development at birth?
Breast consists of lactiferous ducts without any alveoli (also male breast)
Describe breast development at puberty?
Under influence of oestrogen the ducts proliferate & masses of alveoli form at the ends of the branches
Describe breast development at each menstrual cycle?
Involves proliferative changes in alveoli & there may be some secretory activity
Describe breast development during pregnancy?
Under influence of oestrogen, progesterone & prolactin the glandular portion of breast undergoes hypertrophy replacing adipose tissue
Describe breast development from week 16 of pregnancy?
Breast tissue is fully developed for lactation but is quiescent awaiting activation
Describe breast development after parturition?
Breast produces colostrum before mature milk production begins
What are the 5 stages to breast alveoli development during pregnancy?
Describe the anatomy of the breast?
What tissue is dominant in the non-lactating breast?
Adipose tissue
When does glandular tissue develop fully in the female breast?
During pregnancy (replaces adipose tissue)
What are the milk producing cells & what are they stimulated by?
- Stimulated by prolactin
What stimulates contractile myo-epithelial cells?
Oxytocin
What 2 things does lactation consist of?
2. Let down (milk ejection reflex) as infant cannot suck milk out of alveoli where it is produced
What is lactation controlled by?
Neurohumoral reflexes, prolactin is the hormone
How is lactation initiated & controlled?
How is lactation inhibited during pregnancy?
Describe the suckling reflex (role of prolactin)?
Suckling stimulus inhibits hypothalamic release of dopamine (PIF) & prolactin is released in proportion to the strength & duration of suckling
Describe the milk ejection reflex (role of oxytocin)?
What is oxytocin release inhibited by?
Catecholamines, stress can inhibit the reflex