Brachial plexus

Question 1

Root values of musculocutaneous

Answer 1

C5-7

Question 2

Median nerve

Answer 2

c6-T1

Question 3

Ulnar nerve

Answer 3

C8-T1

Question 4

Axillary nerve

Answer 4

C5, 6

Question 5

Long thoracic nerve

Answer 5

C5-7

Question 6

medial pectoral nerve

Answer 6

C8 -T1

Question 7

Lateral pectoral nerve

Answer 7

C5-7

Question 8

how do Upper brachial plexus injuries occur

Answer 8

result from an excessive increase in the angle between the neck and shoulder. This may occur in trauma (see image below) or during the birth of a baby if the shoulders become impacted in the pelvis (shoulder dystocia) and excessive traction is applied to the baby’s neck.

Question 9

What is affected in upper brachial plexus injury

Answer 9

C5 C6

Question 10

What causes lower brachial plexus injury

Answer 10

forced hyperextension or hyperabduction, such as when someone falls from a height and grabs onto a tree branch on the way down. An alternative mechanism of injury is if the baby’s arm is delivered first and traction is applied to the arm to deliver the rest of the baby. Injury to the lower roots of the brachial plexus is known as Klumpke’s palsy.

Question 11

What nerve roots are affected in lower brachial plexus injury

Answer 11

C8 T1