brachial plexus and axillary artery

Question 1

Which spinal nerves form the brachial plexus?

Answer 1

C5-T1

Question 2

How many trunks do the spinal nerves form?

Answer 2

3

Question 3

How many divisions are formed by each trunk?

Answer 3

2 each; 6 total

Question 4

The anterior and posterior divisions join to form how many cords?

Answer 4

3

Question 5

Name the cords of the brachial plexus.

Answer 5

Medial cord, lateral cord, and posterior cord.

Question 6

The cords are named in relation to which structure?

Answer 6

Axillary artery

Question 7

Which brachial plexus nerves branch directly off of spinal nerves?

Answer 7

Long thoracic nerve and dorsal scapular nerve.

Question 8

Segmental innervation of long thoracic nerve.

Answer 8

C5-C7

Question 9

Segmental innervation of dorsal scapular nerve.

Answer 9

C5

Question 10

What structures does the long thoracic nerve supply?

Answer 10

Serratus anterior

Question 11

What structures does the dorsal scapular nerve supply?

Answer 11

Rhomboid major and minor, levator scapula, acromioclavicular joint

Question 12

Which nerves branch off of the medial cord?

Answer 12

Medial pectoral nerve, medial brachial cutaneous nerve, medial antebrachial cutaneous nerve, ulnar nerve, part of median nerve.

Question 13

Which spinal nerves form the upper trunk?

Answer 13

C5 and C6

Question 14

Which spinal nerves form the middle trunk?

Answer 14

C7

Question 15

Which spinal nerves form the lower trunk?

Answer 15

C8 and T1

Question 16

Which divisions form the lateral cord?

Answer 16

The anterior divisions of the upper and middle trunks.

Question 17

Which divisions form the medial cord?

Answer 17

The anterior division of the lower trunk.

Question 18

Which divisions form the posterior cord?

Answer 18

The posterior divisions of all three trunks.

Question 19

What is the segmental innervation of the lateral cord?

Answer 19

C5, C6, and C7

Question 20

What is the segmental innervation of the medial cord?

Answer 20

C8 and T1

Question 21

What is the segmental innervation of the posterior cord?

Answer 21

C5-T1

Question 22

Which nerves branch directly off of the upper trunk?

Answer 22

The suprascapular nerve and the nerve to the subclavius.

Question 23

Which structures does the suprascapular nerve supply?

Answer 23

The supraspinatus, the infraspinatus, and the shoulder joint.

Question 24

What is the segmental innervation of the suprascapular nerve?

Answer 24

C5 and C6

Question 25

What is the segmental innervation of the nerve to the subclavius?

Answer 25

C5 and C6

Question 26

Which structures does the nerve to the subclavius supply?

Answer 26

The subclavius, the diaphragm, and the sternoclavicular joint

Question 27

What is the name of the branch off of the nerve to the subclavian leading to the diaphragm?

Answer 27

The accessory phrenic nerve.

Question 28

Which cords form the median nerve?

Answer 28

The lateral and medial cords?

Question 29

What is the segmental innervation of the median nerve?

Answer 29

C6-T1

Question 30

Which muscles are supplied by the median nerve?

Answer 30

Pronator teres, flexor carpi radialis, palmaris longus, flexor digitorum superficialis, flexor pollicis longus, pronator quadratus, half of flexor digitorum profundus, and most of the thenar muscles.

Question 31

The median nerve supplies which joints?

Answer 31

Elbow and wrist

Question 32

Which skin areas are supplied by the median nerve?

Answer 32

Lateral 3/4 of the palmar surface of the hand and palmar and dorsal aspects of the first 3 1/2 digits.

Question 33

Which nerve branch exclusively off of the lateral cord?

Answer 33

The lateral pectoral nerve and the musculocutaneous nerve.

Question 34

What is the segmental innervation of lateral pectoral nerve?

Answer 34

C5-C7

Question 35

Which structures are supplied by the lateral pectoral nerve?

Answer 35

Pectoralis major

Question 36

What is the segmental innervation of the musculocutaneous nerve?

Answer 36

C5-C7

Question 37

What is the name of the muscles the musculocutaneous nerve runs through?

Answer 37

The coracobrachialis

Question 38

What is the name of the musculocutaneous nerve when it continues into the forearm?

Answer 38

The lateral antebrachial cutaneous nerve.

Question 39

Motor supply of the the musculocutaneous nerve?

Answer 39

Coracobrachialis, biceps brachii, brachialis.

Question 40

Articular supply of the musculocutaneous nerve?

Answer 40

Elbow joint

Question 41

Cutaneous supply of the musculocutaneous nerve?

Answer 41

Lateral aspect of the forearm.

Question 42

Which nerves exclusively branch off the medial cord?

Answer 42

Medial pectoral nerve, medial brachial cutaneous nerve, medial antebrachial cutaneous nerve, ulnar nerve.

Question 43

Segmental innervation of the medial pectoral nerve?

Answer 43

C8 and T1

Question 44

Structures supplied by the medial pectoral nerve?

Answer 44

Pectoralis major and pectoralis minor

Question 45

Segmental innervation of the medial brachial nerve?

Answer 45

T1

Question 46

Structures supplied by the medial brachial nerve?

Answer 46

Skin of medial aspect of the arm

Question 47

Segmental innervation of the medial antebrachial cutaneous nerve?

Answer 47

C8 and T1

Question 48

Structures supplied by the medial antebrachial nerve?

Answer 48

Medial aspect of the forearm.

Question 49

Segmental innervation of the ulnar nerve?

Answer 49

C8 and T1

Question 50

Structures supplied by the ulnar nerve?

Answer 50

Flexor carpi ulnaris, 1/2 flexor digitorum profundus, hypothenar mucles, elbow and wrist joints, 1/4 medial palm, dorsum of hand, digit 5 and 1/2 of 4.

Question 51

Which nerves branch off the posterior cord?

Answer 51

The upper subscapular nerve, lower subscapular nerve, thoracodorsal nerve, axillary nerve, radial nerve.

Question 52

Segmental innervation of the upper subscapular nerve?

Answer 52

C5

Question 53

Structures supplied by the upper subscapular nerve?

Answer 53

Subscapularis

Question 54

Segmental innervation of the lower subscapular nerve?

Answer 54

C6

Question 55

Structures supplied by the lower subscapular nerve?

Answer 55

Subscapularis and teres major

Question 56

Segmental innervation of the thoracodorsal nerve?

Answer 56

C6, C7, C8

Question 57

Structures supplied by the thoracodorsal nerve?

Answer 57

Latissimus dorsi

Question 58

Segmental innervation of the axillary?

Answer 58

C5 and C6

Question 59

Structures supplied by the axillary nerve?

Answer 59

Deltoid, teres minor, shoulder joint, skin of lateral arm.

Question 60

Branch of axillary nerve supplying the skin of the lateral arm?

Answer 60

Lateral brachial cutaneous nerve.

Question 61

Segmental innervation of the radial nerve?

Answer 61

C5-T1

Question 62

Motor supply of the radial nerve?

Answer 62

Triceps brachii, aconeus, all posterior forearm muscles.

Question 63

Articular supply of radial nerve?

Answer 63

Elbow and wrist joints

Question 64

Cutaneous supply of the radial nerve?

Answer 64

Posterior arm and forearm, dorsum of hand, small area below thumb on palm.

Question 65

Dermatome of C4

Answer 65

Skin over acromion process

Question 66

Dermatome of C5

Answer 66

Lateral arm

Question 67

Dermatome of C6

Answer 67

Lateral forearm and digits one and two

Question 68

Dermatome of C7

Answer 68

Skin of palm, digits 2-4

Question 69

Dermatome of C8

Answer 69

Medial forearm, digit five

Question 70

Dermatome of T1

Answer 70

Medial arm

Question 71

Dermatome of T2

Answer 71

Skin of axilla

Question 72

Spinal nerves forming a prefixed brachial plexus?

Answer 72

C4-C8

Question 73

Spinal nerves forming a postfixed brachial plexus?

Answer 73

C6-T2

Question 74

Cause of Erb-Duchenne palsy

Answer 74

Traction injury of excessive increase of angle between neck and shoulder; damage to C5 and/or C6

Question 75

Symptoms of Erb-Duchenne palsy?

Answer 75

Disabled shoulder movements, loss of sensation in C5 and/or C6 dermatomes

Question 76

Cause of Klumpke's palsy?

Answer 76

Injury to C8 and/or T1; forceful abduction of humerus

Question 77

Symptoms of Klumpke's palsy?

Answer 77

Disabled hand and digit movement, loss of sensation in C8 and T1 dermatomes.

Question 78

Condition in which the cords of the brachial plexus and the axillary artery are compressed.

Answer 78

Thoracic outlet syndrome

Question 79

The name of the axillary artery before the axilla?

Answer 79

Subclavian artery

Question 80

The name of the axillary artery after the axilla?

Answer 80

The brachial artery

Question 81

What are the braches of the axillary artery?

Answer 81

Superior thoracic, thracoacromial, lateral thoracic, subscapular, anterior humeral circumflex, posterior humeral circumflex.

Question 82

Which structures are supplied by the superior thoracic artery?

Answer 82

Pectoralis major and minor, subclavius, thoracic wall.

Question 83

Branches of the thoracoacromial artery

Answer 83

Acromial, pectoral, clavicular, and deltoid.

Question 84

Structures supplied by the lateral thoracic artery?

Answer 84

Serratus anterior, pectorals, mammary glands, intercostal muscles

Question 85

What are the branches of the subscapular artery?

Answer 85

Thoracodorsal and circumflex scapular

Question 86

Structures supplied by the thoracodorsal branch of the subscapular artery

Answer 86

Latissimus dorsi and the subscapularis muscles.

Question 87

Structures supplied by the circumflex scapular?

Answer 87

Supraspinatus, infraspinatus, teres major and minor, triceps brachii and part of the deltoid

Question 88

Structures supplied by the anterior and posterior humeral circumflex arteries?

Answer 88

Deltoid, shoulder joint, teres muscles, and proximal humerus.