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Flashcards in Breast Deck (7)
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1

What are the surface markings of the breast?

- Lateral border of sternum to AAL horizontally
- 2nd and 6th ICS vertically
- Medially follows 6th rib
- Superficial to pec major and serratus anterior

2

What are the regions of the breast?

- Circular body, main region of the breast
- Axillary tail, process pointing superolaterally to axilla

3

What are the three main anatomical features of the breast?

- Mammary glands: ducts and 15-20 secretory lobules, with alveoli drained by lactiferous duct
- all ducts converge at nipple
- alveoli produce milk in lobules, with each lobule draining to one lactiferous duct, with all of these converging to areola

- Fibrous stroma: condenses to form suspensory ligaments (of Cooper) - attach and secure breast to dermis and underlying pectoral fascia - separate the secretory lobules of the breast

- Pectoral fascia: base of the breast lies on the fascia - sheet of connective tissue associated with pec major; fibrous and strong layer with coopers ligaments attached

4

What is the arterial vascular supply of the breast?

mammary branches of internal thoracic supply medial side of the breast and nipple/areola

intercostal arteries also supply some branching

lateral thoracic artery branches off the subclavian and supplies the lateral region of the breast

some supply from the thoraco-acromial and thoracodorsal arteries, and also branches from 2nd-4th ICS arteries

5

What is the venous drainage of the breast?

draining to axillary and internal thoracic veins

6

What is the innervation of the breast?

Innervation: branches of intercostal T2-T6, forming anterolateral and anteromedial branches as well as supraclavicular nerves to the upper and lateral parts of the breast

Nipple: lateral cutaneous branch of T4

7

What is the lymphatic drainage of the breast?

- Axillary nodes: located in axilla and accept 75% of lymph
- Parasternal: located next to sternum 20%
- Posterior intercostal: 5% - where ribs articulate with vertebral bodies

- Skin: drains to axillary, inferior deep cervical and infraclavicular nodes
- Nipple and areola: drains to the subareolar lymphatic plexus