Brachial Plexus

Question 0

What does the dorsal scapular nerve innervate?

Answer 0

rhomboids, levator scapulae

Question 1

What is the origin of the dorsal scapular nerve?

Answer 1

posterior aspect of anterior ramus C5 with a frequent contribution from C4

Question 2

What is the origin of the long thoracic nerve?

Answer 2

posterior aspect of anterior rami of C5, C6, and C7

Question 3

What does the long thoracic nerve innervate?

Answer 3

serratus anterior

Question 4

What is the origin of the suprascapular nerve?

Answer 4

superior trunk, receiving fibers from C5, C6, and often C4

Question 5

What does the suprascapular nerve innervate?

Answer 5

supraspinatus and infraspinatus; glenohumeral joint

Question 6

What is the origin of the subclavian nerve?

Answer 6

superior trunk, receiving fibers from C5, C6, and often C4

Question 7

What are the supraclavicular branches of the brachial plexus?

Answer 7

dorsal scapular, long thoracic, suprascapular, and subclavian

Question 8

What is the origin of the lateral pectoral nerve?

Answer 8

side branch of lateral cord, receiving fibers from C5, C6, and C7

Question 9

What is the origin of the musculotaneous nerve?

Answer 9

terminal branch of lateral cord, receiving fibers from C5-C7

Question 10

What is the origin of the median nerve?

Answer 10

lateral root: terminal branch of lateral cord (C6, C7 fibers)

medial root: terminal branch of medial cord(C8, T1 fibers)

Question 11

What is the origin of the medial pectoral nerve?

Answer 11

side branch of medial cord, receiving fibers from C8 and T1

Question 12

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

Answer 12

side branch of medial cord, receiving fibers from C8 and T1

Question 13

What is the origin of the median cutaneous branch of the forearm?

Answer 13

side branch of medial cord, receiving fibers from C8 and T1

Question 14

What is the origin of the ulnar nerve?

Answer 14

larger terminal branch of medial cord, receiving fibers from C8, T1, and often C7

Question 15

What is the origin of the upper subscapular nerve?

Answer 15

side branch of posterior cord, receiving fibers from C5

Question 16

What is the origin of the lower subscaplar nerve?

Answer 16

side branch of posterior cord, receiving fibers from C6

Question 17

What is the origin of the thoracodorsal nerve?

Answer 17

side branch of posterior cord, receiving fibers from C6, C7, and C8

Question 18

What is the origin of the axillary nerve?

Answer 18

terminal branch of posterior cord, receiving fibers from C5 and C6

Question 19

What is the origin of the radial nerve?

Answer 19

larger terminal branch of posterior cord, receiving fibers from C5-T1

Question 20

What is the largest branch of the brachial plexus?

Answer 20

radial nerve

Question 21

What does the lateral pectoral nerve innervate?

Answer 21

pectoralis major

Question 22

What does the musculotaneous nerve innervate?

Answer 22

muscles of anterior compartment of arm (coracobrachialis, biceps brachii, and brachialis); skin of lateral aspect of forearm

Question 23

What does the median nerve innervate?

Answer 23

muscles of anterior forearm compartment (except for flexor carpi ulnaris and ulnar half of flexor digitorum profundus); five intrinsic muscles in half of palm and palmer skin

Question 24

What does the medial pectoral nerve innervate?

Answer 24

pectoralis minor and sternocostal part of pectoralis major

Question 25

What does the medial cutaneous nerve of arm innervate?

Answer 25

skin of medial side of arm

Question 26

What does the median cutaneous nerve of forearm innervate?

Answer 26

skin of medial side of forearm

Question 27

What does the ulnar nerve innervate?

Answer 27

flexor carpi ulnaris and ulnar half of flexor digitorum profundus; most instrisic muscles of hand; skin of hand medial to axial line of digit 4

Question 28

What does the upper subscapular nerve innervate?

Answer 28

superior portion of subscapularis

Question 29

What does the lower subscapular nerve innervate?

Answer 29

inferior portion of subscapularis and teres major

Question 30

What does the thoracodorsal nerve innervate?

Answer 30

lattisimus dorsi

Question 31

What does the axillary nerve innervate?

Answer 31

glenohumeral joint, teres minor and deltoid muscles, skin of superolateral arm (over inferior deltoid)

Question 32

What does the radial nerve innervate?

Answer 32

all muscles of posterior compartmentsof arm and forearm; skin of posterior and inferolateral arm, posterior forearm, and dorsum of hand lateral to axial line of digit 4