Beginner Brachial Plexus Roots and Trunks Quiz

Q1. Which spinal nerve anterior rami usually form the roots of the brachial plexus?

• C1-C4
• C5-T1
• T2-T6
• L1-L5

Q2. Which two roots unite to form the upper trunk of the brachial plexus?

• C5 and C6
• C6 and C7
• C8 and T1
• C7 and C8

Q3. Which root continues as the middle trunk?

• T1
• C8
• C7
• C5

Q4. Which roots unite to form the lower trunk?

• C8 and T1
• C6 and C7
• C7 and C8
• C5 and C6

Q5. Where do the roots of the brachial plexus pass in relation to the scalene muscles?

• Between middle and posterior scalene
• Within sternocleidomastoid
• Between anterior and middle scalene
• Anterior to anterior scalene with the subclavian vein

Q6. Which artery accompanies the brachial plexus through the interscalene interval?

• Common carotid artery
• Facial artery
• Subclavian artery
• External carotid artery

Q7. Which major vein does not normally pass through the interscalene interval with the brachial plexus?

• Axillary vein
• Internal jugular vein
• Subclavian vein
• Brachiocephalic vein

Q8. Which nerve arises directly from the roots of the brachial plexus and supplies serratus anterior?

• Long thoracic nerve
• Axillary nerve
• Suprascapular nerve
• Radial nerve

Q9. Which nerve arises mainly from the C5 root and supplies the rhomboids?

• Median nerve
• Dorsal scapular nerve
• Ulnar nerve
• Musculocutaneous nerve

Q10. Which branch arises from the upper trunk and passes toward the suprascapular notch?

• Long thoracic nerve
• Dorsal scapular nerve
• Suprascapular nerve
• Phrenic nerve