Histology

Question 1

What type of epithelium in the larger ducts

Answer 1

Columnar

Question 2

What type of epithelium in the secretory acini?

Answer 2

Cuboidal/low columnar

Question 3

What epithelium covers the nipple?

What tissues make up the nipple?

Answer 3

• stratified squamous covers it

- made of smooth muscle and connective tissue

Question 4

What is merocrine secretion?

Answer 4

The proteins in milk are made in the rER, packaged in the Golgi apparatus and secreted via vesicles (v) which merge with the apical membrane to release only their contents into the duct system

Question 5

What is apocrine secretion?

Answer 5

Part of the membrane is lost when it buds off e.g.

Lipid droplets (L) can be seen within these secreting cells of two adjacent mammary acini. L1 is just about to bud off, surrounded by membrane and carrying a small amount of cytoplasm with it. L2 has just been released – note the

Question 6

Percentage of water in human milk

Answer 6

88%

Question 7

Percentage of protein in human milk?

Answer 7

1.5%

Question 8

Percentage of carbohydrate in human milk?

Answer 8

7% (mainly lactose)

Question 9

Main carbohydrate in human milk?

Answer 9

Lactose

Question 10

Percentage of lipid in human milk?

Answer 10

3.5%

Question 11

Changes in mammary gland in 1st trimester

Answer 11

-ducts elongate and branch
-epithelial cells proliferate
myoepithelial cells proliferate

Question 12

Changes in mammary gland in 2nd trimester

Answer 12

• gland tissue develops and the secretory alveoli differentiate
• plasma cells and lymphocytes invade the connective tissue

Question 13

Changes in mammary gland in 3rd trimester?

Answer 13

• secretori alveoli continue to mature

- rER develops