Axilla and Brachial Plexus

Question 1

Which muscle forms the anterior wall of the axilla?

Answer 1

Pectoralis major

Question 2

Where does the brachial vein becomes the axillary vein?

Answer 2

Lower border of teres major

Question 3

Which muscle forms the posterior border of the axilla?

Answer 3

Teres major

Question 4

Where does the subclavian artery become axillary artery?

Answer 4

Lateral border of first rib

Question 5

The brachial plexus is formed from an interwining of what nerves?

Answer 5

Anterior rami of C5-T1

Question 6

From proximal to distal, what does the brachial plexus contain? (Really Tired Drink Coffee Now)

Answer 6

Roots
Trunks
Divisions
Cords
Nerves

Question 7

What are the roots of the brachial plexus?

Answer 7

Each of the anterior rami

Question 8

What are the specific trunks of the brachial plexus?

Answer 8

Superior - combined anterior rami of C5 & C6
Middle - anterior rami of C7
Inferior - combined anterior rami of C8 & T1

Question 9

Each trunk divides to give what?

Answer 9

Anterior and posterior divisions

Question 10

What are cords formed from?

Answer 10

Combined anterior and posterior divisions

Question 11

How are cords named?

Answer 11

According to the relationship with axillary artery

Question 12

What are the named cords?

Answer 12

Medial
Lateral
Posterior

Question 13

What is the medial cord formed from?

Answer 13

Anterior division of inferior trunk

Question 14

What is the lateral cord formed from?

Answer 14

Anterior divisions of superior and middle trunks

Question 15

What is the posterior cord formed from?

Answer 15

Posterior division of all three trunks

Question 16

The cords combine to give what?

Answer 16

Named nerves

Question 17

What are the named nerves of the brachial plexus?

Answer 17

Ulnar
Musculocutaneous
Axillary
Radial
Median

Question 18

What is the ulnar nerve formed from?

Answer 18

Medial cord

Question 19

What is the musculocutaneous nerve formed from?

Answer 19

Lateral cord

Question 20

What forms the axillary and radial nerves?

Answer 20

Posterior cord

Question 21

What forms the median nerve?

Answer 21

Medial and lateral cords

Question 22

Where are the roots and trunks found?

Answer 22

Between anterior and middle scalene muscles

Question 23

Where are the divisions found?

Answer 23

Posterior to subclavian muscles

Question 24

Where are the cords found?

Answer 24

Distal to first rib around axillary artery

Question 25

What does the musculocutaneous nerve supply?

Answer 25

Coracobrachialis
Biceps brachii
Brachialis

Question 26

What does the axillary nerve wrap around?

Answer 26

Posterior aspect of surgical neck of humerus

Question 27

What does the radial nerve wrap around?

Answer 27

Posterior aspect of mid-shaft of humerus