Fetal Breast Development Flashcards
Fetal breast development at five weeks gestation
Galactic Band
Fetal breast development at 16 weeks gestation
Shallow pit an inversion of 8 to 15 strips
Fetal breast development at 24-32 weeks gestation
Maternal hormones can cause colonization of milk-like substances
Fetal breast development Just before birth
Mammary pit elevates
Neonate
“Witches milk”
The milk line
Why running from the actual to the inginal area in which breast tissue or nipples can develop
Common place for accessory breast tissue engorgement
Axilla
Tanners 5 stages or breast development
- Puberty: elevation of the nipple
- 11yrs: subareolar glandular tissue growth
- 12yr: increased glandular tissue
- 13yr: increased separation, size, color of areola
- 15yrs: final adolescent development
Stages of breast development from puberty through lactation
A
B
C
D. Pregnancy
E. Lactation
Breast placement vertical axis
2-6 rib
Hypoplastic 3-5th rib
Breast placement horizontal axis
Typical breast covers from sternum to axilla
Hypoplastic is widely spaced
The body of the breast
Corpus mammae
Extends into axilla
Partially extends into the epigastric area
The body of the breast Parenchyma
Glandular tissue
The body of the breast Stroma
Adipose and connective tissue
Blood vessels
Nerves
Lymphatics
Makes milk
Areola
Intermingles with the glandular tissue
Breast tissue. Components Co-mingled
Cooper’s Ligaments
Glandular tissue
Main milk ducts
Subcutaneous fat
Intragladular fat
Cooper’s Ligaments
Provide support framework for the breast
Glandular tissue
Lobules consist of clusters of alveoli, which are lined with milk secreting epithelial cells (lactocytes)
Main milk ducts
Branch close to the base of the nipple with no lactiferous sinuses
Subcutaneous fat
Thin, near the nipple, becoming more substantial further from the nipple
Intraglandular fat
Intermingles with the glandular tissue growth
Fatty tissue
Subcutaneous fat is minimal near the nipple, increases in thickness further away from the nipple
Retromammary fat
Intraglandular fat
Pectoral muscle
Coopers ligaments droop
Pregnancy not lactation that causes sagging (age, hormone)
Lobes and Lobules
Lobe: group of lobules
Lobule: group of alveoli
Duct System
Ductal network
Main milk ducts
Milk duct
(Grapes on a vine)
Alveolus
Lobular artery
Myoepithelial cells
Secretory alveolar epithelium
Lobular vein
Small connecting milk duct
Intralobular duct
