KIN 100 - Axilla and Brachial Plexus (lecture 7)

Question 1

Where is the axilla located

Answer 1

a pyramind shape space inferior to the glenohumeral joint (the armpit)

Question 2

What is the purposes of the axilla

Answer 2

1. Passageway for structures passing between thorax an upper limb

Question 3

Describe the formation of the apex of the axilla

Answer 3

proximal and is a space bound by the clavicle, first rib, and superior border of the scapula

Question 4

Describe the formation of the base of the axilla

Answer 4

distal and is formed by skin and connective tissue

Question 5

Describe the formation of the anterior wall of the axilla

Answer 5

formed by pectoralis major, pectoralis minor, subclavius

Question 6

Describe the formation of the posterior wall of the axilla
(Bone and muscle)

Answer 6

formed by scapula, subscapularis, latissimus dorsi, TERES MAJOR

Question 7

Describe the formation of the medial wall of the axilla
(Bones and muscles)

Answer 7

formed by the ribs, external intercostals, and serratus anterior

Question 8

Describe the formation of the lateral wall of the axilla

Answer 8

formed by the bicipital groove

Question 9

List the five contents of the axilla

Answer 9

1. Axillary artery and it’s branches
2. Axillary vein and it’s tributaries
3. Lymphatic vessels and lymph nodes
4. Fat
5. Brachial plexus

Question 10

Describe the pathway of deoxygenated blood through the heart to the lungs

Answer 10

1. Superior/inferior vena cava
2. Right atrium
3. Right atrioventricular (tricuspid) valve
4. Right ventricle
5. Pulmonary semilunar valve
6. Pulmonary trunk
7. Right/Left pulmonary arteries
8. Lungs

Question 11

Describe the pathway of oxygenated blood from the lungs through the heart

Answer 11

1. Right/left pulmonary veins
2. left atrium
3. left atrioventricular or mitral (bicuspid) valve
4. Left ventricle
5. aortic semilunar valve
6. Aorta
7. Rest of body for distribution

Question 12

What arteries make up the arch of the aorta (3)

Answer 12

1. Brachiocephalic trunk
2. Left common carotid artery
3. Left subclavian artery

Question 13

What does the brachiocephalic trunk branch into and where do they extend

Answer 13

branch into the right subclavian artery and the right common carotid artery
- they extend until they reached the first rib

Question 14

Describe where the axillary artery exists

Answer 14

between first rib and teres major

Question 15

What does the medial vein and lateral vein combine into (moving up veins)

Answer 15

brachial vein

Question 16

Describe how brachial plexus is formed

Answer 16

formed in the neck by the union of the anterior primary rami of C5, C6, C7, C8, and T1 spinal nerves

Question 17

How many roots are there in the brachial plexus

Answer 17

5

Question 18

How many trunks in the brachial plexus

Answer 18

3

Question 19

How many divisions are there in the brachial plexus

Answer 19

6

Question 20

How many cords in the brachial plexus

Answer 20

3

Question 21

How many nerves are there at the end of the brachial plexus

Answer 21

5

Question 22

Where do sensory neurons run (as seen on the spinal cord cross section)

Answer 22

runs posteriorly , runs along dorsal root into dorsal horn

Question 23

Where do motor neurons run (as seen on the spinal cord cross section)

Answer 23

cellbody found on ventral horns, exits along ventral root
- but can also run through the dorsal roots for posterior sensations