Brachial Plexus

Question 1

What is the brachial plexus?

Answer 1

Network of nerve fibres that supplies skin and musculature of upper limb

Question 2

What does the brachial plexus pass through?

Answer 2

Neck

Axilla

Question 3

What forms the brachial plexus?

Answer 3

Anterior rami

of C5, C6, C7, C8, T1

Question 4

What can the brachial plexus be divided into?

Answer 4

Roots
Trunks
Divisions
Cords
Branches

Question 5

What are the roots of the brachial plexus?

Answer 5

C5, C6, C7, C8, T1

Question 6

What do the nerve roots of the brachial plexus pass through?

Answer 6

Anterior and medial scalene muscles

Question 7

What are the trunks of the brachial plexus?

Answer 7

Superior
Middle
Inferior

Question 8

Where are the trunks formed?

Answer 8

Base of neck

Question 9

What is the superior trunk made up of?

Answer 9

C5 and C6

Question 10

What is the middle trunk made up of?

Answer 10

C7

Question 11

What is the inferior trunk made up of?

Answer 11

C8 and T1

Question 12

What are the divisions of the brachial plexis?

Answer 12

Each trunk divides into an
anterior division
and a posterior division

Question 13

Where are the divisions formed?

Answer 13

Posterior triangle of neck

Question 14

What are the cords of the brachial plexus?

Answer 14

Medial cord
Lateral cord
Posterior cord

Question 15

Where are the cords formed?

Answer 15

Axilla region

Question 16

The cords are named according to their…?

Answer 16

Relative position to the axillary artery

Question 17

What is the medial cord made up of?

Answer 17

Anterior division of inferior trunk

Question 18

What is the lateral cord made up of?

Answer 18

Anterior division of superior trunk

Anterior division of middle trunk

Question 19

What is the posterior cord made up of?

Answer 19

Posterior divisions of all three trunks

Question 20

What does the medial cord divide into?

Answer 20

Ulnar nerve

Half of the median nerve

Question 21

What does the lateral cord divide into?

Answer 21

Musculocutaneous nerve

Half of the median nerve

Question 22

What does the posterior cord divide into?

Answer 22

Axillary nerve

Radial nerve

Question 23

What forms the ulnar nerve?

Answer 23

Half of the medial cord

Question 24

What forms the musculocutaneous nerve?

Answer 24

Half of the lateral cord

Question 25

What forms the median nerve?

Answer 25

Half of the medial cord

Half of the lateral cord

Question 26

What forms the axillary nerve?

Answer 26

Half of the posterior cord

Question 27

What forms the radial nerve?

Answer 27

Half of the posterior cord

Question 28

What are the roots of the ulnar nerve?

Answer 28

C8, T1

Question 29

What are the roots of the musculocutaneous nerve?

Answer 29

C5, C6, C7

Question 30

What are the roots of the median nerve?

Answer 30

C6, C7, C8, T1

Question 31

What are the roots of the axillary nerve?

Answer 31

C5, C6

Question 32

What are the roots of the radial nerve?

Answer 32

C5, C6, C7, C8, T1

Question 33

Where do the branches continue?

Answer 33

Into the upper limb

Question 35

Which nerves branches off the roots of the brachial plexus? Which roots?

Answer 35

Dorsal scapular nerve - C5

Long thoracic nerve - C5, C6, C7

Question 37

What nerves branch off the medial cord? What are their nerve roots?

Answer 37

Medial pectoral nerve

Medial cutaneous nerve of arm

Medial cutaneous nerve of forearm

C8, T1

Question 38

What nerves branch off the lateral cord of the brachial plexus? What are their nerve roots?

Answer 38

Lateral pectoral nerve - C5, C6, C7

Question 39

What nerves branch off the posterior cord of the brachial plexus?

Answer 39

Upper subscapular nerve - C5 C6?

Thoracodrosal nerve - C6, C7, C8

Lower subscapular nerve - C5 C6?

Question 40

What nerves branch off the superior trunk? What are their nerve roots?

Answer 40

Suprascapular nerve - posteriorly

Subclavian nerve - anteriorly

C5, C6