Anatomy Dissection 7

Question 1

What is the medial wall of the axilla?

Answer 1

Superolateral aspect of chest

Question 2

What muscle forms the anterior wall of axilla?

Answer 2

Pectoralis major

Question 3

Other than pectoralis major - what is the other main muscle for climbing?

Answer 3

Latissimus dorsi

Question 4

What is the axillary vein a continuation of?

Answer 4

Brachial vein

Question 5

At what point does the brachial vein become the axillary?

Answer 5

At lower border of teres major muscle

Question 6

What muscle contributes to the posterior wall of axilla?

Answer 6

Teres major

Question 7

Where can pulsations of the subclavian artery be palpated?

Answer 7

Where artery crosses first rib

Question 8

At what point does the subclavian artery become the axillary artery?

Answer 8

At lateral border of first rib

Question 9

What is the brachial plexus formed from?

Answer 9

Anterior rami of spinal nerves C5-T1

Question 10

From proximal to distal, what does the brachial plexus consist of?

Answer 10

1. Roots
2. Trunks
3. Divisions
4. Cords
5. Named nerves

Question 11

The anterior rami of C5-T1 nerves mix their fibres to form what?

Answer 11

Trunks

Question 12

What do trunks give rise to?

Answer 12

Divisions

Question 13

What makes up the superior trunk?

Answer 13

Combined anterior rami of C5 and C6 spinal nerves

Question 14

What makes up the middle trunk?

Answer 14

Anterior ramus of C7 spinal nerve

Question 15

What makes up the inferior trunk?

Answer 15

Combined anterior rami of C8 & T1 spinal nerves

Question 16

Each trunk divides to give anterior and posterior divisions, which combine to give what?

Answer 16

Cords

Question 17

Describe the medial cord?

Answer 17

Direct continuation of anterior division of inferior trunk

Question 18

Describe the lateral cord?

Answer 18

Formed from anterior division of superior and middle trunks

Question 19

Describe the posterior cord?

Answer 19

Formed from posterior divisions of all three trunks

Question 20

What does the ulnar nerve continue directly from?

Answer 20

Medial cord

Question 21

What named nerve continues directly from lateral cord?

Answer 21

Musculocutaneous nerve

Question 22

What does the posterior cord divide into?

Answer 22

Axillary nerve and radial nerve

Question 23

What do the medial and lateral cords both contribute to form?

Answer 23

The median nerve

Question 24

Where do the roots and trunks of brachial plexus mainly lie?

Answer 24

Between anterior and middle scalene muscles in root of neck

Question 25

What part of plexus lies immediatly posterior to subclavian vessels in root of neck (deep to clavicle)?

Answer 25

Divisions

Question 26

What part of plexus lies around the axillary artery, which is distal to first rib?

Answer 26

Cords

Question 27

What named nerve supplies coracobrachialis muscle, biceps brachii and brachialis muscles?

Answer 27

Musculocutaneous

Question 28

What nerve lies superior to radial nerve and wraps around the posterior aspect of surgical neck of humerus?

Answer 28

Axillary

Question 29

What nerve wraps around the posteruor aspect of the mid-shaft of the humerus, where it may be injured by a mid-shaft humeral fracture?

Answer 29

Radial nerve

Question 30

What is the most medial named nerve?

Answer 30

Ulnar

Question 31

What nerve forms the middle of the M shaped configuration of the named nerves in axilla?

Answer 31

Median nerve