Beginner Brachial Plexus Roots and Trunks Quiz

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

• T2-T6
• C1-C4
• C5-T1
• L1-L5

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

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

Q3. Which root continues as the middle trunk?

• C7
• C5
• C8
• T1

Q4. Which roots unite to form the lower trunk?

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

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

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

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

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

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

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

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

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

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

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

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

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