Online quiz (MCQ) on the anatomy of the brachial plexus

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Created on September 04, 2022 By

Prof Kehinde Oluwadiya

Brachial Plexus

Brachial Plexus Quiz

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Category: Brachial Plexus

1. Which of the following statements about the brachial plexus is INCORRECT?

1. long thoracic nerve arises from roots

2. Erb’s palsy occurs following traction to upper roots and trunk

3. posterior cord has five branches

4. suprascapular nerve arises from trunks

5. trunks lie behind clavicle on first rib

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Category: Brachial Plexus

2. The brachial plexus:

1. arises from C6 to T1

2. lies in the anterior triangle of the neck

3. carries sympathetic fibres

4. supplies all the skin of the upper limb

5. the posterior divisions supply the flexor compartments

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Category: Brachial Plexus

3. Which of the following is correct regarding axillary artery:

1. first part is separated from the cords by axillary sheath

2. lies posterior lateral to vein – all three parts

3. medial root of median nerve crosses behind ????? to join lateral root.

4. leaves axillar through quadrangular space

5. None of the above

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Category: Brachial Plexus

4. Which of the following is INCORRECT, regarding branches of the posterior cord?

1. C5, 6 – upper subscapular nerve

2. C6, 7, 8 – thoracodorsal nerve

3. C5, 6 – lower subscapular nerve

4. C7, 8 – axillary

5. C5, 6, 7, 8, T1 – radial nerve

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Category: Brachial Plexus

5. Regarding the brachial plexus:

1. the dorsal scapular nerve is the only branch from the trunks

2. the axillary nerve is derived from C5, 6, 7, 8, T1

3. the ulnar nerve is the largest branch of the whole plexus

4. the axillary nerve passes below teres major

5. the thoracodorsal nerve supplies lateral dorsi

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Category: Brachial Plexus

6. Which is true of brachial plexus?

1. the trunks lie behind scalene muscle

2. accessory phrenic nerve fibres run to superior mediastinum with long thoracic nerve

3. median nerve divides at the carpal tunnel, lateral branch supplies thenar muscles and medial branch supplies lumbricals (2)

4. ulnar nerve in 95% of cases picks up C7 fibres from lateral cord

5. branches of radial nerve rise just proximal to their destination

7 / 27

Category: Brachial Plexus

7. A 45-year-old man is unable to initiate abduction of the arm following reduction of a dislocated shoulder. Damage to which nerve is most likely to be responsible for this condition:

1. the suprascapular nerve

2. the long thoracic nerve

3. the radial nerve

4. the infrascapular nerve

5. the axillary nerve

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Category: Brachial Plexus

8. Brachial plexus:

1. the five roots lie in front of scalenus anterior muscle

2. the anterior division of the central trunk runs on as the medial cord

3. the suprascapular nerve is the only branch from the trunks

4. the radial nerve is a branch of the lateral cord

5. the ulna nerve is a branch of the posterior cord

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Category: Brachial Plexus

9. Regarding the brachial plexus:

1. the medial cord has three branches

2. the lateral cord has fibres from C7, C8 and T1

3. the musculocutaneous nerve is a branch of the medial cord

4. the five roots are found from the posterior rami and C5 – T1 nerves

5. none of the above

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Category: Brachial Plexus

10. The posterior interosseous nerve DOES NOT supply:

1. the periosteum of the radius and ulna

2. the skin over the dorsal aspect of the thumb

3. extensor carpi ulnaris

4. extensor pollicis brevis

5. the interosseous membrane

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Category: Brachial Plexus

11. Which nerve does NOT make contact with periosteum?

1. radial nerve

2. axillary nerve

3. median nerve

4. ulnar nerve

5. anterior interosseous nerve

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Category: Brachial Plexus

12. The nerve supply of serratus anterior is:

1. axillary nerve

2. C4

3. dorsal scapular nerve

4. thoracodorsal nerve

5. long thoracic nerve

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Category: Brachial Plexus

13. The musculocutaneous nerve passes through which muscle?

1. coracobrachialis

2. short head of biceps

3. brachialis

4. medial head of triceps

5. long head of biceps

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Category: Brachial Plexus

14. With respect to the brachial plexus:

1. the lateral cord lies in the axilla

2. the median nerve is the largest branch of the whole plexus

3. the roots lie within the posterior triangle of the neck

4. the ulnar nerve is a branch of the lateral cord

5. the musculocutaneous nerve is a branch of the medial cord

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Category: Brachial Plexus

15. With respect to the brachial plexus:

1. it consists of the entire anterior rami of C5 → T1

2. there are five roots, three trunks, five divisions and three cords

3. there are two branches from the divisions

4. there are a total of 13 branches from the cords

5. there are two branches from the roots

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Category: Brachial Plexus

16. Which of the following is correct regarding the brachial plexus:

1. the roots lie behind scalenus medius muscle

2. the trunks are formed behind the clavicle

3. at the first rib, the cords are formed

4. the cords give branches around second part of artery

5. None of the above

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Category: Brachial Plexus

17. Which is CORRECT?

1. medial pectoral nerve C8 T1

2. ulnar nerve C7 C8 T1

3. dorsal scapular nerve C5 C6

4. long thoracic nerve C6 C7 C8

5. None of the above

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Category: Brachial Plexus

18. The peripheral nerve arising directly from the upper trunk of the brachial plexus is the:

1. dorsal scapular

2. thoracodorsal

3. suprascapular

4. upper subscapular

5. lower subscapular

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Category: Brachial Plexus

19. As it emerges from the axilla, the median nerve lies

1. lateral

2. anterior

3. medial

4. posterior

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Category: Brachial Plexus

20. Regarding the brachial plexus:

1. the lateral cord contains fibres from C5, 6, 7 & 8

2. the posterior cord has fibres from C5, 6, 7, 8 & T1

3. the medial cord has fibres from C8 and T1

4. the suprascapular nerve arises from C5

5. the ulnar nerve is a continuation of the medial cord

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Category: Brachial Plexus

21. Regarding the brachial plexus:

1. the suprascapular nerve arises from the anterior C5, 6 division

2. ulnar nerve often carries fibres from C7

3. the radial nerve leaves the axilla via the quadrangular space

4. the radial artery lies anterior to the medial and lateral roots of the median nerve

5. the long thoracic nerve arises from the C5 nerve root only

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Category: Brachial Plexus

22. Which of the following has some nerve supply from the radial nerve?

1. long head of biceps

2. coracobrachialis

3. short head of biceps

4. brachialis

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Category: Brachial Plexus

23. Which nerve supplies serratus anterior?

1. axillary nerve (C5, C6)

2. long thoracic nerve (C5, C6, C7)

3. musculocutaneous nerve (C5, C6)

4. thoracodorsal nerve (C6, C7, C8)

5. suprascapular nerve (C5, C6)

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Category: Brachial Plexus

24. Which is the smallest branch of the medial cord of the brachial plexus?

1. medial pectoral nerve

2. medial root of the median nerve

3. medial cutaneous nerve of the arm

4. medial cutaneous nerve of the forearm

5. ulnar nerve

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Category: Brachial Plexus

25. Which nerve is a branch of the lateral cord of the brachial plexus?

1. upper subscapular nerve

2. thoracodorsal nerve

3. musculocutaneous nerve

4. ulnar nerve

5. lower subscapular nerve

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Category: Brachial Plexus

26. Which of the following DOES NOT arise from the roots of the brachial plexus?

1. dorsal scapular

2. nerve to serratus anterior

3. medial pectoral nerve

4. nerve to subclavius

27 / 27

Category: Brachial Plexus

27. The nerve supply of pectoralis minor is from the:

1. dorsal scapular nerve

2. long thoracic nerve

3. pectoral nerves

4. lower subscapular nerve

5. axillary nerve

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