Axilla and Arm Concepts/Structure Relations

Question 1

Apex of axilla

Answer 1

1st rib, clavicle

Question 2

Base of axilla

Answer 2

skin of armpit

Question 3

Anterior boundary of axilla

Answer 3

pectoral mm.

Question 4

Posterior boundary of the axilla

Answer 4

scapula, subscapularis

Question 5

medial boundary of the axilla

Answer 5

thoracic wall. serratus anterior muscle

Question 6

lateral boundary of the axilla

Answer 6

humerus

Question 7

What are the contents of the axilla?

Answer 7

axillary artery, axillary vein, axillary lymph nodes, 3 CORDS of the brachial plexus

Question 8

Spinal nerves converge to form the ventral rami (and dorsal though we are not considering these)–> after which point:

Answer 8

axons become redistributed into peripheral nerves containing multiple spinal nerve segments

Question 9

What nerves are excluded from the formation of plexuses?

Answer 9

intercostal nerves

EX: T1 spinal nerve is associated with T1 intercostal nerve

Question 10

Is it the anterior or posterior rami of the spinal nerves that converge to form plexuses?

Answer 10

The anterior (ventral) rami converge to form plexuses

Question 11

The axillary vein is

Answer 11

anterior to the axillary artery

Question 12

The lateral thoracic artery passes along the lateral border of the

Answer 12

pectoralis minor muscle

Question 13

The anterior and posterior circumflex humeral arteries branch off the ___________ at the level of the __________

Answer 13

axillary artery, surgical neck of the humerus

Question 13

The anterior and posterior circumflex humeral arteries branch off the ___________ at the level of the __________

Answer 13

axillary artery, surgical neck of the humerus

Question 14

The posterior circumflex humeral artery travels

Answer 14

posterior with the axillary nerve

quadrangular space

Question 15

The thoracodorsal artery is the continuation of the ___________ inferior to the _______________

Answer 15

subscapular artery, circumflex scapular artery origin

Question 16

The lateral cord of the brachial plexus

Answer 16

is lateral to the axillary artery

Question 17

The medial cord of the brachial plexus

Answer 17

is medial to the axillary artery

Question 18

The posterior cord of the brachial plexus is

Answer 18

posterior to the axillary artery

Question 19

The musculocutaneous nerve pierces which muscle?

Answer 19

coracobrachialis

Question 20

The median nerve runs _______ with the _____________

Answer 20

parallel, brachial artery

Question 21

The radial nerve passes posterior to the humerus along with the _________

Answer 21

profunda brachii artery (triceps hiatus)

Question 22

The tendon of the latissimus dorsi muscle attaches to the humerus in between the tendons

Answer 22

of teres major and pec major muscles

Question 23

The long thoracic nerve is _________ to the surface of the serratus anterior muscle

Answer 23

immediately lateral (superficial)

Question 24

The glenohumeral ligaments are

Answer 24

anterior to the glenohumeral joint