Intermediate Brachial Plexus Roots and Trunks Quiz
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This quiz contains 10 questions. Click below to begin.
Q1. What is the usual root value of the upper trunk?
- C6-C7
- C7-C8
- C8-T1
- C5-C6
Q2. What is the usual root value of the middle trunk?
- C5-C6
- C8-T1
- C7
- T1-T2
Q3. What is the usual root value of the lower trunk?
- C5-C6
- C7 only
- C6-C7
- C8-T1
Q4. Which two named branches commonly arise from the upper trunk?
- Long thoracic and dorsal scapular nerves
- Suprascapular nerve and nerve to subclavius
- Median and ulnar nerves
- Axillary and radial nerves
Q5. From which parts of the plexus does the long thoracic nerve usually arise?
- C5-C7 roots
- Upper and lower trunks only
- Posterior cord only
- C8-T1 roots only
Q6. Which brachial plexus branch commonly pierces middle scalene?
- Ulnar nerve
- Median nerve
- Suprascapular nerve
- Dorsal scapular nerve
Q7. What structure lies inferior to the brachial plexus trunks as they cross the root of the neck?
- Thyroid isthmus
- Internal carotid artery
- External jugular vein only
- Subclavian artery
Q8. At approximately what region do the brachial plexus trunks divide into anterior and posterior divisions?
- At the carotid bifurcation
- Inside the vertebral canal
- At the angle of the mandible
- Near the lateral border of the first rib
Q9. What is meant by a prefixed brachial plexus?
- Greater inferior contribution, often C6-T2
- Complete absence of C5
- Greater superior contribution, often C4-C8
- A plexus formed only by thoracic nerves
Q10. What is meant by a postfixed brachial plexus?
- Greater inferior contribution, often C6-T2
- Greater superior contribution, often C4-C8
- A plexus formed only by C5-C7
- Fusion of all trunks into one nerve