Brachial Plexus

Question 1

For each cord, give the respective branches:
lateral
lateral and medial
medial
posterior

Answer 1

lateral: musculotaneous
lateral and medial: median
medial: ulnar
posterior: radial and axillary

Question 2

What nerve comes from the root C5? What does it innervate?

Answer 2

Dorsal Scapular; rhomboids and levator scapulae

Question 3

What nerve comes from the roots C5-C7? What does it innervate?

Answer 3

Long Thoracic Nerve; serratus anterior

Question 4

What two nerves come from the superior trunk? give their roots as well

Answer 4

Nerve to sublcavius (C5-C6)
Suprascapular nerve (C5-C6)

Question 5

What does musculocutaneous nerve innervate and what are its roots?

Answer 5

anterior arm, sensory to lateral arm; C5-C7

Question 6

The lateral cords contribution to the median nerve come from what roots?

Answer 6

C6-C7

Question 7

What does the median nerve innervate?

Answer 7

flexors in forearm and thenar, sensory to the palmar, thumb to half of the 4th, with dorsal of middle and distal phalanges to 2nd to half of 4th

Question 8

The lateral pectoral nerve comes directly from what cord? What are its roots? What does it innervate?

Answer 8

lateral; C5-C7; pec major

Question 9

All of the nerves coming directly from the medial cord have the same roots. What are they?

Answer 9

C8-T1

Question 10

What are the nerves coming from the medial cord?

Answer 10

contribution to median nerve, ulnar nerve, medial pectoral nerve, medial cutaneous of arm, medial cutaneous of forearm

Question 11

Give all of nerves that come from the posterior cord and their roots and what they innervate

Answer 11

axillary nerve (C5-C6); deltoid and teres minor
radial nerve (C5-T1); extensors
upper subscapular nerve (C5-C6); subscapularis
Thoracodorsal nerve (C6-C8); latissimus dorsi
Lower subscapular nerve (C5-C6); subscapularis and teres major