Breast

Question 0

How many lobes does the mammary gland have?

Answer 0

15-20

They open via ducts in to nipples

Question 1

Where does the breast extend from?

Answer 1

1. Breast extends from 2nd rib to 6th rib

2. From lateral margin of sternum to mid axillary line

Question 2

What does the medial 2/3rd of breast lie on

Answer 2

Pectoralis major

Question 3

What does the lateral 1/3rd of breast lie on?

Answer 3

Serratus anterior

Question 4

What does the inferior aspect of the breast lie on?

Answer 4

Rests on upper aspect of external oblique and rectus sheath

Question 5

What are the ducts of each lobule lines by?

Answer 5

Columnar or cuboidal epithelium

Question 6

What are the short excretory ducts lines by?

Answer 6

Squamous epithelium

Question 7

What is the arterial supply of the lateral breast ?

Answer 7

1. Lateral thoracic (from axillary from subclavian)
2. Thoracoacromial (from axillary from subclavian)
3. Superior thoracic and subscapular to a lesser extent
4. Lateral perforating branches of intercostal arteries

Question 8

What is the blood supply of medial breast?

Answer 8

Internal thoracic (mammary) - from subclavian - perforating branches 1st to 4th intercostal space

Question 9

Venous drainage of lateral breast

Answer 9

Thoracoacromial vein

Lateral thoracic vein - axillary vein - subclavian vein

Question 10

Venous drainage of medial breast

Answer 10

Internal thoracic vein - subclavian vein