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Anatomy of Breast, Axilla, Chest Wall > Axilla > Flashcards

Flashcards in Axilla Deck (7)
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1

Describe the four walls of the axilla

4 walls, apex and base

Base: axillary fascia and skin (armpit)
Apex: cervicoaxillary canal

Anterior wall: pectoralis major and minor

Posterior wall: subscapularis muscle (anterior surface of scapula) + teres major and latissimus dorsi

Lateral wall: humuerus, bicipital groove

Medial wall: serratus anterior (over upper 4-5 ribs)

2

Describe the cervicoaxillary canal and its borders

Aperture of the axilla. Most structures which pass between the neck and upper extremity go through the cervicoaxillary canal

Borders:
Anterior, clavicle
Posterior, scapula
Medial, 1st rib

3

Broadly, what are the contents of the axilla

Great vessels and nerves of the upper extremity, surrounded by loose connective tissue

Vessels and nerves enclosed with the *axillary sheath*

- Axillary artery and vein
- Brachial plexus (medial lateral posterior cords)
- Intercostobrachial nerve
- Long thoracic nerve (part of brachial, 5-7th)
- Axillary lymph node groups

4

What are the 3 portions of the axillary artery defined by

Relationship to pectoralis minor:
Superior, posterior, and inferior to.

5

At what point does the subclavian artery become the axillary artery

At the lateral edge of the 1st rib

6

At what point does the axillary artery become the brachial artery

At the lower margin or teres major

7

Describe the 1st portion of the axillary artery

1st portion: Supreme thoracic artery, medial/superior to pectoralis minor, supplies thoracic wall 1st an 2nd intercostal spaces

2nd portion: Two branches:
- Thoracoacromial artery
- Lateral thoracic artery