Axilla and brachial plexus

Question 1

What does the axillary sheath contain

Answer 1

axillary artery
axillary vein
brachial plexus

Question 2

what makes up the anterior wall of the axillary

Answer 2

pectoralis major
pectoralis minor
clavipectoral fascia (present in the anterior thoracic wall)
subclavius

Question 3

what makes up the medial axillary wall

Answer 3

thoracic wall
serrates anterior

Question 4

what makes up the lateral axillary wall

Answer 4

intertubecular sulcus of the humerus

Question 5

what makes up the posterior wall of the axillary

Answer 5

subscapularis
teres major
latissimus dorsi
long head of triceps brachii

Question 6

What are the roots of the brachial plexus
where do they originate
where do they go through?

Answer 6

ventral rami of C5-T1 that originates in the neck
The roots pass between anterior scalene and middle scalene
The roots are located superior and posterior to subclavian artery

Question 7

what is the interscalene triangle

Answer 7

brachial plexus and subclavian artery pass between anterior scalene and middle scalene

Question 8

What are the trunks of the brachial plexus
and where are they located

Answer 8

The trunks are located superior to clavicle
1. superior trunk: comes from roots C5, C6

2. Middle trunk: comes from root C7
3. Inferior trunk: comes from C8, T1

Question 9

What are the divisions of the brachial plexus

Answer 9

They are located under the clavicle
1. Superior anterior division (comes from the superior trunk-C5,C6)
2. Superior posterior division (comes from the superior trunk - C5, C6)
3. Middle anterior division (comes from the middle trunk (C7)
4. Middle posterior division (comes from the middle trunk -C7)
5. inferior anterior division (comes from the inferior trunk - C8,T1)
6. inferior posterior division (comes from the inferior trunk - C8, T1)

Question 10

What are the cords of the brachial plexus

Answer 10

lateral cord
posterior cord
medial cord
named in reference to axially artery

Question 11

What makes up the lateral cord of the brachial plexus

Answer 11

Superior anterior division (Superior trunk - C5, C6)
and the
Middle anterior division (middle trunk - C7)

Question 12

What makes up the posterior cord of the brachial plexus

Answer 12

Superior posterior division (superior trunk -C5, C6)
Middle posterior division (middle trunk -C7)
Inferior posterior division (inferior trunk - C8, T1)

Question 13

What makes up the medial cord of the brachial plexus

Answer 13

Inferior anterior division (inferior Trunk - C8, T1)

Question 14

What nerves go from the lateral cord

Answer 14

1. lateral pectoral nerve
2. musculocutaneous
3. Part of median

Question 15

What nerves come from the posterior cord

Answer 15

1. upper subscapular
2. lower sub scapular
3. thoracodorsal
4. axillary
5. radial

Question 16

What nerves come from the medial cord

Answer 16

1. medial pectoral C6,T1)
2. medial brachial cutaneous
3. medial anti brachial cutaneous
4. part of median
5. ulnar

Question 17

What nerves branch off of the roots?

Answer 17

Dorsal scapular (C4,C5)
Long thoracic (C5-C7)

Question 18

What nerves branch off the trunks

Answer 18

Suprascapular (C5,C6)
Nerve to subclavian (C5,C6)

Question 19

branches of the medial cord

Answer 19

Medial pectoral
Medial cutaneous or arm and forearm
Ulnar
Median

Question 20

Branch’s of the lateral cord

Answer 20

Musculocutaneous
Median
Lateral pectoral

Question 21

Branches of the posterior cord

Answer 21

Upper subscapular
Lower subscapular
thoracodorsal
Axillary
Radial nerve