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Committee Exam 4 > BRACHIAL PLEXUS & NERVES OF THE UPPER LIMB > Flashcards

BRACHIAL PLEXUS & NERVES OF THE UPPER LIMB Flashcards

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1
Q

The brachial plexus is a ___________ plexus:
a) Sensory
b) Somatic
c) Autonomic
d) Peripheral

A

Somatic nerve

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2
Q

Nerves originating from brachial plexus supplies muscles of ________

A

Upper limb

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3
Q

Which spinal nerves contribute to the brachial plexus?
a) C2-T1
b) C5-T1
c) C6-T1
d) C7-T2

A

C5-T1

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4
Q

Which artery is anterior to brachial plexus?

A

Subclavian artery

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5
Q

Enlist the parts of the brachial plexus
(from medial to lateral)?

A

Roots
Trunks
Divisions
Cords
Nerves

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6
Q

Roots pass between which two muscles?

A

the anterior scalene and middle scalene muscles

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7
Q

Union of ____ and _____ roots forms the superior (upper) trunk.

A

C5 and C6

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8
Q

Union of _____ and ______ roots forms the inferior (lower) trunk.

A

C8 and T1

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9
Q

Union of the anterior divisions of the upper and middle trunks forms the _____________.

A

lateral cord.

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10
Q

Anterior division of the inferior trunk continues as medial cord. True or false?

A

True

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11
Q

Posterior cord is formed by?
a) C5 and C6
b) union of anterior divisions
c) union of all posterior divisions
d) union of anterior and posterior divisions.

A

Union of all three posterior divisions

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12
Q

Which nerve is not derived from the brachial plexus?
a) Axillary nerve
b) Musculocutaneous nerve
c) Median nerve
d) Phrenic nerve

A

Phrenic nerve

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13
Q

Lateral cord divides into ________ and ___________

A

Musculocutaneous nerve and lateral root of median nerve.

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14
Q

Medial cord divides into ____________ and _____________

A

Ulnar nerve and medial root of median nerve

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15
Q

Lateral and medial roots unite to form the:
a) Ulnar nerve
b) Median nerve
c) Axillary nerve
d) Radial nerve

A

Median nerve

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16
Q

Posterior cord divides into ulnar and radial nerves. True or false?

A

False. Posterior cord divides into axillary and radial nerves.

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17
Q

Which nerve supplies the rhomboid muscles?

A

Dorsal scapular nerve

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18
Q

Which spinal cord segments give rise to the dorsal scapular nerve?
a) C5-C6
b) C5-T1
c) C6-T1
d) C7-T1

A

C5-C6

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19
Q

What is the course of the dorsal scapular nerve?
a) It passes through the brachial plexus and then innervates the rhomboid muscles
b) It arises from the brachial plexus and runs along the posterior axillary wall
c) It arises from the C5-C6 spinal cord segments and runs deep to the trapezius muscle to innervate the rhomboid muscles
d) It arises from the C7-T1 spinal cord segments and runs superficial to the trapezius muscle to innervate the rhomboid muscles

A

It arises from the C5-C6 spinal cord segments and runs deep to the trapezius muscle to innervate the rhomboid muscles

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20
Q

What is the sensory innervation of the dorsal scapular nerve?
a) Lateral aspect of the arm
b) Medial aspect of the arm
c) Posterior aspect of the shoulder
d) None

A

None

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21
Q

What is the course of the long thoracic nerve?
a) It arises from the cervical plexus and runs along the posterior axillary wall
b) It arises from the brachial plexus and runs along the medial aspect of the arm
c) It arises from the brachial plexus and runs along the lateral aspect of the arm
d) It arises from the roots of the cervical spine and runs along the anterior aspect of the chest wall

A

It arises from the roots of the cervical spine and runs along the anterior aspect of the chest wall

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22
Q

Which muscle(s) does the long thoracic nerve innervate?

A

Serratus anterior

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23
Q

Which spinal cord segments give rise to the long thoracic nerve?
a) C5-C6
b) C5-T1
c) C6-T1
d) C7-T1

A

C5-T1

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24
Q

What is the course of the suprascapular nerve?
a) It arises from the cervical plexus and runs along the posterior axillary wall
b) It arises from the brachial plexus and runs along the medial aspect of the arm
c) It arises from the brachial plexus and runs along the lateral aspect of the arm
d) It arises from the upper trunk of the brachial plexus and passes through the suprascapular notch

A

It arises from the upper trunk of the brachial plexus and passes through the suprascapular notch

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25
Q

Which muscles does the suprascapular nerve innervate?
a) Infraspinatus and teres minor
b) Supraspinatus and teres minor
c) Infraspinatus and supraspinatus
d) Subscapularis and supraspinatus

A

Infraspinatus and supraspinatus

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26
Q

Nerve to the subclavius muscle supplies the _________ muscle.

A

Subclavius muscle

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27
Q

Which spinal cord segments give rise to the suprascapular nerve?
a) C5-C6
b) C5-T1
c) C6-T1
d) C7-T1

A

C5-T1

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28
Q

The peripheral nerve that originate directly from the divisions of the brachial plexus is?
a) Radial nerve
b) Axillary nerve
c) Musculocutaneous nerve
d) None

A

None

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29
Q

Lateral cord gives ________________ nerve

A

lateral pectoral nerve

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30
Q

The posterior cord of the brachial plexus does NOT gives rise to which nerve?
a) superior subscapular nerve
b) inferior subscapular nerve
c) medial pectoral nerve
d) thoracodorsal nerve

A

medial pectoral nerve

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31
Q

The medial cord of the brachial plexus does NOT gives rise to which nerve?
a) thoracodorsal nerve
b) medial pectoral nerve
c) medial cutaneous nerve of arm
d) medial cutaneous nerve of forearm

A

thoracodorsal nerve

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32
Q

What is the origin of the lateral pectoral nerve?
a) C5, C6, C7
b) C5, C6, C7, C8
c) C6, C7, C8
d) C7, C8, T1

A

C5, C6, C7

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33
Q

Which muscle(s) does the lateral pectoral nerve innervate?
a) Pectoralis major
b) Pectoralis minor
c) Both a and b
d) None of the above

A

Pectoralis major

34
Q

Which cord(s) of the brachial plexus does the lateral pectoral nerve arise from?

A

Lateral cord

35
Q

What is the course of the lateral pectoral nerve in the body?
a) It runs along the lateral aspect of the chest wall, penetrates clavipectoral fascia.
b) It runs along the medial aspect of the chest wall, with penetrating clavipectoral fascia
c) It runs through the armpit region
d) None of the above

A

It runs along the lateral aspect of the chest wall, penetrates clavipectoral fascia.

36
Q

Which nerve(s) does the medial pectoral nerve branch off from?
a) Brachial plexus
b) Phrenic nerve
c) Cervical plexus
d) None of the above

A

Brachial plexus

37
Q

Which muscles does the medial pectoral nerve innervate?

A

Innervates the pectoralis minor and lower part of the pectoralis major muscles.

38
Q

What is the origin of the medial pectoral nerve?
a) C5, C6, C7
b) C5, C6, C7, C8
c) C6, C7, C8
d) C7, C8, T1

A

C6, C7, C8

39
Q

The nerve that supplies skin over the medial side of the distal third of the arm is?

A

Medial cutaneous nerve of the arm

40
Q

What is the origin of Medial cutaneous nerve of the arm?

A

C8, T1

41
Q

What is the sensory function of the medial cutaneous nerve of the forearm?

A

Innervates the skin of the medial forearm

42
Q

What is the course of the medial cutaneous nerve of the forearm in the body?
a) It runs along the lateral aspect of the forearm
b) It runs along the medial aspect of the forearm
c) It runs through the armpit region
d) None of the above

A

It runs along the medial aspect of the forearm

43
Q

Superior subscapular nerve supplies the subscapularis muscle. True or false?

A

True.

44
Q

Inferior subscapular nerve innervates _________ and __________ muscles.

A

subscapularis and teres major muscles.

45
Q

What is the origin of Inferior subscapular nerve?

A

C5, C6

46
Q

Which nerve is responsible for motor innervation of the latissimus dorsi muscle?
a) Median nerve
b) Radial nerve
c) Ulnar nerve
d) Thoracodorsal nerve

A

Thoracodorsal nerve

47
Q

What is the origin of the thoracodorsal nerve?
a) C5-T1 spinal nerves
b) C6-C8 spinal nerves
c) T1-T4 spinal nerves
d) T4-T7 spinal nerves

A

T1-T4 spinal nerves

48
Q

What is the course of the thoracodorsal nerve in the body?
a) It runs along the lateral aspect of the forearm
b) It runs along the medial aspect of the forearm
c) It runs through the armpit region
d) It runs alongside the long thoracic nerve and the thoracodorsal artery

A

It runs alongside the long thoracic nerve and the thoracodorsal artery

49
Q

What is the sensory function of the thoracodorsal nerve?
a) Innervates the skin of the anterior arm and forearm
b) Innervates the skin of the lateral arm and forearm
c) Innervates the skin of the posterior arm and forearm
d) None of the above

A

None. It is a motor nerve

50
Q

Which nerve is responsible for motor innervation of the biceps brachii muscle?
a) Radial nerve
b) Median nerve
c) Ulnar nerve
d) Musculocutaneous nerve

A

Musculocutaneous nerve

51
Q

What is the origin of the musculocutaneous nerve?
a) C5-C6 spinal nerves
b) C6-C7 spinal nerves
c) C7-C8 spinal nerves
d) C8-T1 spinal nerves

A

C5-C6 spinal nerves

52
Q

Which other nerve(s) does the musculocutaneous nerve branch off from?
a) Axillary nerve
b) Median nerve
c) Ulnar nerve
d) None of the above

A

Median nerve

53
Q

What is the course of the musculocutaneous nerve in the body?
a) It runs through the armpit region
b) It runs along the medial aspect of the forearm
c) It pierces the coracobrachialis muscle and runs between the biceps brachii and brachialis muscles
d) It runs alongside the long thoracic nerve and the thoracodorsal artery

A

It pierces the coracobrachialis muscle and runs between the biceps brachii and brachialis muscles

54
Q

Which other muscle(s) does the musculocutaneous nerve provide motor innervation to, in addition to the biceps brachii?

A

Brachioradialis, coracobrachialis

55
Q

Which spinal segments contribute to the ulnar nerve?

A

C8-T1

56
Q

What is the course of the ulnar nerve in the upper arm?
a) It runs through the axilla
b) It runs along the anterior aspect of the arm
c) It runs along the posterior aspect of the arm
d) It runs alongside the brachial artery

A

It runs through the axilla

57
Q

Which muscles does the ulnar nerve innervate in the forearm?

A

Flexor carpi ulnaris and flexor digitorum profundus

58
Q

What is the sensory function of the ulnar nerve?

A

Innervates the skin of the medial hand and digits 4-5

59
Q

Which bone in the wrist is commonly referred to as the “ulnar” bone?
a) Scaphoid bone
b) Lunate bone
c) Triquetral bone
d) Pisiform bone

A

Pisiform bone

60
Q

Which of the following muscles is innervated by the median nerve?
a) Flexor pollicis longus
b) Flexor digitorum superficialis
c) Pronator teres
d) Brachioradialis

A

Flexor digitorum superficialis

61
Q

The median nerve arises from which cords of the brachial plexus?

A

Lateral and anterior cords

62
Q

Which of the following structures does the median nerve NOT pass through?
a) Carpal tunnel
b) Cubital tunnel
c) Pronator teres
d) Flexor digitorum superficialis

A

Cubital tunnel

63
Q

Which is a common cause of median nerve compression?

A

Carpal tunnel syndrome

64
Q

Which of the following muscles is NOT innervated by the radial nerve?
a) Brachioradialis
b) Extensor carpi radialis longus
c) Triceps brachii
d) Extensor digitorum

A

Triceps brachii

65
Q

The radial nerve arises from which roots of the brachial plexus?

A

C5-T1

66
Q

__________________ nerve originates from the radial nerve in the axilla.

A

Posterior cutaneous nerve of the arm

67
Q

Inferior lateral cutaneous nerve of the arm supplies the skin over the inferior lateral side of the arm. True or false?

A

True

68
Q

At the medial margin of the cubital fossa radial nerve divides into superficial and deep branches. True or false?

A

False. At the lateral margin of the cubital fossa radial nerve divides into superficial and deep branches

69
Q

Which nerve innervates the extensor carpi radialis brevis muscle?

A

Deep branch of radial nerve

70
Q

Which spinal segments contribute to the formation of the axillary nerve?
a. C4-C5
b. C5-C6
c. C6-C7
d. C7-T1

A

C5-C6

71
Q

Which muscle(s) does the axillary nerve innervate?
a. Deltoid
b. Supraspinatus
c. Infraspinatus
d. Teres minor
e. All of the above

A

All of the above

72
Q

The axillary nerve arises from which cord of the brachial plexus?

A

Posterior cord

73
Q

The axillary nerve passes through Quadrangular space. True or false?

A

True

74
Q

What is the sensory function of the axillary nerve?
a. Sensation to the lateral arm
b. Sensation to the medial arm
c. Sensation to the lateral forearm
d. Sensation to the medial forearm

A

Sensation to the lateral arm

75
Q

The dermatome of the thumb is supplied by which nerve root?

A

C6

76
Q

Which dermatome is associated with the tip of the middle finger?

A

C7

77
Q

Which dermatome is associated with medial side of elbow?

A

T1

78
Q

Abduction of the arm at the glenohumeral joint is controlled predominantly by?

A

C5

79
Q

Flexion of the forearm at the elbow joint is controlled primarily by C7. True or false?

A

False. C6

80
Q

Extension of the forearm at the elbow joint is controlled mainly by ______

A

C7

Committee Exam 4 (35 decks)

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