Anatomy Of Breast

Question 1

Explain the vertical and horizontal surface anatomy

Answer 1

Vertical- Extend from 2nd - 6th ribs: midclavicular line

Horizantal- parasternal (lateral) border to mid maxillary line

Question 2

How much does the breast extend to pecteralis major and serratus anterior

Answer 2

PM= 2/3
SA = 1/3

Question 3

Where an external oblique muscle does the breast extend

Answer 3

Inferomedial quadrant

Question 4

Where is the surface and any of the nipple

Answer 4

4th intercostal space - lateral to MCL

Question 5

How many lobules are in each breast

Answer 5

15-20 = which open to lactiferous ducts and lactiferous sinus

Question 6

What surrounds the lobules

Answer 6

1. Connective tissue septum’s = called retinaculae cutis (Cooper’s ligament)
2. Superior septum in breast=called suspensory ligament

Question 7

What makes breast appear with a smooth contour

Answer 7

Fat between breast tissue

Question 8

What is contained in the areola and nipple

Answer 8

Opening of lactiferous ducts
Sebaceous glands (Montgomery)
Involuntary muscle and lymphatics-deep

Question 9

Explain the maxillary tail (spense)

Answer 9

Process of mammary tissues that extend up and lateral from 3rd rib in axilla then enters axilla in deep fascia

Question 10

What is the medial and lateral blood supply

Answer 10

M: medial mammaryartenes and antenna intercostal arteries - internal thoracic artery (Subclavian artery branch)
L: lateral mammary branches- lateral thoracic arteries (axillary artery branch)

Question 11

What other branches give blood to breast

Answer 11

Thoraco-acromial artery (AA)

Lateral branches = 2nd,3rd, 4th poster intercostal arteries (TA)

Question 12

Explain venous drainage

Answer 12

Superficial vers to deep veins to maxillary, internal thoracic and posterior intercostal veins

Question 13

Describe the lymphatic of the breast

Answer 13

Lymph from each mammary gland drains directly or indirectly via 7 groups of lymph nodes
5 of these groups are the maxillary lymph nodes

Question 14

What are the 7 lymph nodes and what they accompany

Answer 14

1. Pectoral /anterior = lateral thoracic artery, vein
2. Subscapular/posterior= subscapular veins
3. Humeral/lateral group = distal aouillary vein
4. Central= intercostobrachial nodes
5. apical /infraclavicular = proximal axillary vein
6. Deltopectoral= detopectoral triangle
7. Parasternal = Internal thoracic artery

Question 15

How does the mammary tissue drain

Answer 15

• Subareolar pleaus - pectoral nodes
• medial border - parasternal nodes
• interomedial quadrant - subperitoneal and pelvis
• 75% via maxillary tail - pectoral nodes