Brachial Plexus

Question 1

What is a plexus?

Answer 1

network of interjoining nerves/ vessels

Question 2

What are the first 3 dissection steps to see BP?

Answer 2

1. reflect pectoralis major
2. reflect pectoralis minor
3. remove axillary vein/ tributaries

Question 3

Where is access to the axillary brachial plexus?

Answer 3

deep to anterior wall of axilla

Question 4

What is the orientation landmark of the brachial plexus?

Answer 4

pectoralis minor inserting on coracoid process

Question 5

What is the brachial plexus formed from?

Answer 5

anterior rami of spinal nerves C5/C6/C7/C8/T1

Question 6

Why is there a C8 spinal nerve?

Answer 6

spinal nerves- above vertebrae

Question 7

What form the roots of the brachial plexus?

Answer 7

anterior rami of spinal nerves C5-T1

Question 8

What provides innervation to muscles of the upper limb?

Answer 8

brachial plexus

Question 9

Starting from the spinal cord what are the components of the brachial plexus? (5x)

Answer 9

roots
trunks
divisions
cords
branches

Question 10

What is the menomic for the 5 parts of the brachial plexus?

Answer 10

Beer Cold Drink To Remember
branches/ cords/ divisions/ trunks/ roots

Question 11

What part of the brachial plexus does the clavicle pass through?

Answer 11

divisions

Question 12

What are the cords of the brachial plexus deep to?

Answer 12

insertion of pectoralis minor

Question 13

How many trunks are there?

Answer 13

3

Question 14

What are the 3 trunks called?

Answer 14

upper/ middle/ lower

Question 15

How many divisions are there?

Answer 15

6x- anterior/ posterior (from each trunk)

Question 16

How many cords are there?

Answer 16

3

Question 17

What are the 3 cords called- in order superior to inferior?

Answer 17

lateral/ posterior/ medial

Question 18

What nerves arise from roots/ trunks in the supraclavicular region of the BP? (leave early)

Answer 18

dorsal scapular nerve
long thoracic nerve
suprascapular nerve
nerve to subclavius

Question 19

What muscles are associated with dorsal scapular nerve?HINT: muscles associated with medial border of scapula

Answer 19

levator scapulae
rhomboid major
rhomboid minor

Question 20

What muscle is associated with long thoracic nerve?

Answer 20

serratus anterior

Question 21

What muscles are associated with suprascapular nerve?

Answer 21

suprasoinatus
infraspinatus

Question 22

What muscle is associated with nerve to subclavius?

Answer 22

subclavius

Question 23

What are the 2 branches from roots?

Answer 23

Dorsal scapular nerve C5
Long thoracic nerve C5-C7

Question 24

What are the 2 branches from trunks?

Answer 24

Suprascapular nerve C5/C6
Nerve to subclavius C5/C6

Question 25

What are the arteries that give blood supply to upper limb? - in order superior to inferior

Answer 25

subclavian/ axillary/ brachial

Question 26

How are the cords of the brachial plexus named?

Answer 26

in relation to axillary artery posterior/ lateral/ medial

Question 27

Where does pectoralis minor insert?

Answer 27

coracoid process of scapula

Question 28

What branch arises from the lateral cord?

Answer 28

Musculocutaneous nerve

Question 29

What branch arises from medial cord?

Answer 29

Ulnar nerve

Question 30

What branch arises from medial/ lateral cords?

Answer 30

Median nerve

Question 31

What branches arise from the cords? superior to inferior

Answer 31

Musculocutaneous nerve Median nerve Ulnar nerve

Question 32

What branches arise from the posterior cord?

Answer 32

axillary nerve radial nerve thoracodorsal nerve upper subscapular nerve lower subscapular nerve

Question 33

Where is the posterior cord in relation to pectoralis minor?

Answer 33

deep

Question 34

How many branches arise from the posterior cord?

Answer 34

5

Question 35

What muscles are associated with axillary nerve?

Answer 35

deltoid teres minor

Question 36

What muscles are associated with radial nerve?

Answer 36

extensors of the upper limb

Question 37

What muscle is associated with thoracodorsal nerve?

Answer 37

latissimus dorsi

Question 38

What muscle is associated with upper subscapular nerve?

Answer 38

subscapularis

Question 39

What muscles are associated with lower subscapular nerve?

Answer 39

subscapularis teres major

Question 40

What does the axillary nerve innervate?

Answer 40

deltoid teres minor

Question 41

What muscles are associated with lateral root of median nerve?

Answer 41

anterior forearm hand

Question 42

What muscles are associated with musculocutaneous nerve?

Answer 42

biceps brachii brachialis coracobrachiales

Question 43

What muscles are associated with lateral pectoral nerve?

Answer 43

pectoralis major pectoralis minor