Upper limb nerves

Question 1

What roots do the superior, middle, and inferior trunks come off of? What cords do they give rise to?

Answer 1

Superior - C5 and C6

Gives rise to the lateral and the posterior cords

Middle - C7

Gives rise to the lateral and posterior cords

Inferior - C8 and T1

Gives rise to the medial and posterior cord

Question 2

What branches does the lateral, posterior and medial cords give rise to?

Answer 2

Lateral cord - Musculocutaneous nerve and the median nerve

Posterior cord - Axillary nerve and the radial nerve

Medial cord - Median nerve and the ulnar nerve

Question 3

Generally, which branches innervates the forearm extensors?

Answer 3

Median nerve

Question 4

What nerve innervates teres minor, triceps and deltoids?

Answer 4

Axillary nerve

Question 5

Which nerve innervates biceps, brachialis, and coracobrachialis?

Answer 5

Musculocutaneous nerve

Question 6

Which nerve branch is most medial? What does it innervate?

Answer 6

Ulnar nerve. Digiti minmi, 3rd, 4th lumbricals, 1st dorsal and palmer interosseous, flexor pollicus brevis, adductor pollucis

also flexor carpi ulnaris and flexor digitorum profundus 3 and 4

Question 7

What nerve innervates forearm flexors ad pronators… and passes under the flexor retinaculum?

Answer 7

Median nerve

Question 8

What artery runs btw the lateral, medial and posterior cords of the brachial plexus?

Answer 8

axillary artery

Question 9

Which two scalene muscles do the roots of the brachial plexus originate from?

Answer 9

Btw the Anterior and Medius scalene