Anatomy

Question 1

Confines of the breast

Answer 1

• Extends from 2nd rib to 6th rib

- From sternal edge to mid axillary line

Question 2

Deep boundary of the breast

Answer 2

• Posterior capsule lying on the pec major / serratus anterior
• Thickened continuation of Scarpa’s fascia posterior to the breast

Question 3

Breast lymphatics

Answer 3

• Run deep to the capsule in submammary space to:
  1. Axilla (anterior -> central -> apical)
  2. Infraclavicular
  3. Internal thoracic

Question 4

Axillary nodes

Answer 4

1. Supratrochlear
2. Lateral
3. Posterior
4. Anterior
5. Central
6. Infraclavicular
7. Apical

Question 5

Bloody supply of breast

Answer 5

• Lateral thoracic A/V + internal thoracic A/V
• Some venous drainage via posterior intercostal V, which communicates w/ the internal vertebral plexus -> vertebral metastatic spread

Question 6

Surgical levels of axillary LNs

Answer 6

I = below the lower/lateral edge of pec minor

II = behind/deep to pec minor

III = above/medial pec minor