Integumentary System (mammary Glands)

Question 1

General Structure of Breast or mammary gland

Answer 1

• compound tubular gland
• consists of 15-25 breast lobes
• lobes are divided into lobules
• Stroma (Inner layer)
• parenchyma (outer layer)

Question 2

Stroma of mammary gland

Answer 2

1. Interlobular (between lobules)
   - dense irregular Tissue
   - adipose tissue
2. Intralobular (Inside lobules)
   - Loose CT
   - more cellular, less fibrous

Question 3

Paremchyma of mammary gland

Answer 3

• composed of epithelial tissue

Question 4

Changes in mammary gland
(Inactive - active during pregnancy - lactating)

Answer 4

1. Inactive
   - undifferentiated ducts, No alveoli
   - big stroma: dense CT, adipose tissue
   - small lobules: lined by simple cuboidal epithelium
2. Active (during pregnancy)
   - proliferation and differentiation of alveoli at Terminal ends of ducts
3. Lactating
   - secretion of milk
   - big amount of parenchyma
   - lobules and alveoli developed
   - alveoli lined by simple cuboidal or columnar epithelium

Question 5

Secretion of milk

Answer 5

• is Controlled by Prolactin
• merocrine (Released by cell) for proteins
• apocrine (Parts of cells Go) for Lipid droplets

Question 6

Myoepithelial cells

Answer 6

• flattened, branched cells
• surround epithelial cells of alveoli and ducts
• contract under influence of oxytocin to discharge the milk

Question 7

Nipple

Answer 7

• contains smooth muscle
• oriented parallelly to lactiferous ducts and circularly near the base