Lect. 2 Axilla & Brachial Plexus

Question 1

What forms the anterior border of the axilla?

Answer 1

Pectoralis major and minor

Question 2

What forms the medial border of the axilla?

Answer 2

Serratus anterior

Question 3

What forms the apex border of the axilla?

Answer 3

Clavicle, 1st rib, scapula

Question 4

What forms the posterior border of the axilla?

Answer 4

Subscapularis, teres major, latissimus dorsi

Question 5

What forms the base of the axilla?

Answer 5

Axillary fascia, subcutaneous tissue, skin

Question 6

Describe the direction the axillary artery travels and what covers it?

Answer 6

The axillary artery courses dismally within a connective tissue sleeve called the axillary sheath

Question 7

What artery stems from the first part (lateral border of the 1st rib/medial to pectoralis minor) of the axillary artery?

Answer 7

The superior thoracic artery

Question 8

What arteries stem from the second part (posterior to pectoralis minor) of the axillary artery?

Answer 8

The thoracoacromial artery & lateral thoracic artery

Question 9

What arteries form the third part (lateral to pectoralis minor) of the axillary artery?

Answer 9

Anterior & posterior circumflex humeral arteries subscapular artery

Question 10

What arteries branch off the subscapular artery?

Answer 10

The circumflex scapular artery & thoracodorsal artery

Question 11

Name the three directional terms of the level I nodes.

Answer 11

Lateral, anterior, and posterior

Question 12

Where are the level I nodes located?

Answer 12

Near the 3rd part of the axillary artery/vein

Question 13

True or False
The level II node is near the 2nd part of the axillary artery/vein?

Answer 13

True

Question 14

Level III nodes (apical) are located near what part of the axillary artery/vein?

Answer 14

The 1st part

Question 15

What’s the percentage of lymphatic drainage of the breast that enters the axillary lymph nodes?

Answer 15

Approximately 75%

Question 16

What structures receive approximately 75% of all lymphatic drainage of the breast?

Answer 16

Axillary lymph nodes

Question 17

Where does the other 25% of the lymphatic drainage of the breast go?

Answer 17

The parasternal lymph nodes

Question 18

True or False
The brachial plexus arises through a complex exchange of axons from the ventral rami of C5-T1.

Answer 18

True

Question 19

Where do the roots of the brachial plexus pass through?

Answer 19

The interscalene triangle between the scalenus anterior and scalenus medius