Brachial plexus

Question 1

What are the spinal roots of the brachial plexus?

Answer 1

C5, C6, C7, C8, T1

Question 2

What are the three trunks of the brachial plexus?

Answer 2

Superior
Middle
Inferior

Question 3

What are the three cords of the brachial plexus?

Answer 3

Lateral
Posterior
Medial

Question 4

What does the dorsal scapular nerve innervate?

Answer 4

(pierces middle scalene)

Innervates rhomboids and sometimes levator scapulae

Question 5

What are the roots of the dorsal scapular nerve?

Answer 5

C4, C5

Question 6

What are the roots of the long thoracic nerve?

Answer 6

C5, C6, C7

Question 7

What muscles does the long thoracic nerve pierce?

Answer 7

C5/C6 pierce middle scalene

C7 passes in front of muscle

Question 8

What muscle does the long thoracic nerve innervate?

Answer 8

Serratus anterior

Question 9

What condition does damage to the long thoracic nerve cause?

Answer 9

Winged scapula

Question 10

What are the nerve roots for the suprascapular nerve?

Answer 10

C4, C5, C6

Question 11

What does the suprascapular nerve innervate?

Answer 11

Supraspinatus
Infraspinatus
Glenohumeral joint (Hilton’s law)

Question 12

What are the nerve roots of the lateral pectoral nerve?

Answer 12

C5, C6, C7

Question 13

What does the lateral pectoral nerve innervate?

Answer 13

Pectoralis major
Pectoralis minor
(via communicating branch to medial pectoral nerve)

Question 14

What are the nerve roots of the medial pectoral nerve?

Answer 14

C8, T1

Question 15

Which muscle does the medial pectoral nerve pierce?

Answer 15

Pectoralis minor

Question 16

Which muscles are innervated by the medial pectoral nerve?

Answer 16

Pectoralis major

Pectoralis minor

Question 17

What are the nerve roots of the axillary nerve?

Answer 17

C5, C6

Question 18

What does the axillary nerve innervate?

Answer 18

Teres minor
Deltoid
Glenohumeral joint
Skin over inferior deltoid

Question 19

What are the nerve roots of the musculocutaneous nerve?

Answer 19

C5-C7

Question 20

What does the musculocutaneous nerve innervate?

Answer 20

Muscles of the anterior arm - biceps, brachialis, coracobrachialis
Gives off branch to humerus (nutrient foramen) and continues as lateral cutaneous nerve of forearm

Question 21

What are the nerve roots of the median nerve?

Answer 21

C6, C7, C8, T1

Question 22

What does the median nerve innervate?

Answer 22

Muscles of the anterior forearm
Thenar eminence
Lumbricals
Sensory innervation of medial palm of hand (and 3.5 digits)

Question 23

Which ligament covers the carpal tunnel?

Answer 23

Transverse carpal ligament

Question 24

What are the nerve roots of the ulnar nerve?

Answer 24

C8, T1

Question 25

What does the ulnar nerve innervate?

Answer 25

Innervates flexor carpi ulnaris and flexor digitorum profundis
Some intrinsic muscles of the hand
Sensory innervation of lateral palm of hand and 1.5 digits

Question 26

What causes claw hand?

Answer 26

Damage to the ulnar nerve

Question 27

What are the nerve roots of the radial nerve?

Answer 27

C5-C8, T1

Question 28

What does the radial nerve innervate?

Answer 28

Posterior (extensor) compartment of arm and forearm

Question 29

What conditions are caused by damage to the radial nerve?

Answer 29

Saturday night palsy/ Honeymoon palsy
Wrist drop
Wartenberg syndrome