Muscles Root And Nerve UEs

Question 1

Rhomboids

Answer 1

C4, 5* Dorsal Scapular Just prior to upper trunk

Question 2

Supraspinatus

Answer 2

C5*, 6* Suprascapular Upper trunk

Question 3

Infraspinatus

Answer 3

C5*, 6* Suprascapular Upper trunk

Question 4

Deltoid

Answer 4

C5*, 6* Axillary Posterior cord

Question 5

Biceps brachii

Answer 5

C5*, 6* Musculocutaneous Lateral cord (just after takeoff of lateral pectoral)

Question 6

Brachioradialis

Answer 6

C5*, 6* Radial Posterior cord

Question 7

Serratus anterior

Answer 7

C5*, 6*, 7* Long thoracic Comes off nerve roots

Question 8

Pectoralis major: Clavicular

Answer 8

C5, 6*, 7 Lateral pectoral Lateral cord

Question 9

Pectoralis major: Sternal

Answer 9

C8, T1 Medial pectoral Medial cord

Question 10

Flexor carpi radialis

Answer 10

C6*, 7* Median Lateral cord, upper and middle trunk

Question 11

Pronator teres

Answer 11

C6*, 7* Median, lateral cord, Upper and middle trunks

Question 12

ECRL

Answer 12

C6*, 7* Radial Posterior cord (Insert needle just next to BR toward lateral epicondyle)

Question 13

Latissimus dorsi

Answer 13

C6, 7*, 8 Thoracodorsal Posterior cord between branches of subscapular

Question 14

Triceps

Answer 14

C6, 7*, 8 Radial Posterior cord

Question 15

Anconeus

Answer 15

C6, 7*, 8 Radial Posterior cord

Question 16

EDC

Answer 16

C7*, 8 Radial Posterior interosseous Posterior cord (Active by extending the middle finger)

Question 17

Flexor digitorum sublimis (superficialis)

Answer 17

C7, 8* Median Insert needle just medial to mid-point between biceps tendon and mid-wrist (flex at PIP joints)

Question 18

Extensor indicis

Answer 18

C7, 8* Radial Posterior cord Last muscle innervated by posterior interosseous (deep radial motor branch)

Question 19

Extensor carpi ulnaris

Answer 19

C7, 8* Radial

Question 20

Flexor pollicis longus

Answer 20

C7, 8*, T1 Median

Question 21

Flexor digitorum profundus

Answer 21

C7, 8*, T1 Median (deep) Ulnar (superficial)

Question 22

Flexor carpi ulnaris

Answer 22

C8*, T1 (some individuals may have C7 contribution) Ulnar

Question 23

First dorsal interosseus

Answer 23

C8*, T1* Ulnar

Question 24

Abductor digiti minimi

Answer 24

C8*, T1* Ulnar

Question 25

Abductor pollicis brevis

Answer 25

C8*, T1* Median

Question 26

The anterior interosseous nerve innervates what muscles?

Answer 26

• Flexor pollicis longus
• Flexor digitorum longus (digits 2 and 3)
• Pronator quadratus

Question 27

What muscles are spared in a posterior interosseous neuropathy as opposed to a radial neuropathy at the spiral groove?

Answer 27

• Brachioradialis
• Long and short head of the extensor carpi radialis

Question 28

What are the sensory findings in a posterior interosseous neuropathy?

Answer 28

• No cutaneous sensory loss
• May have pain in the forearm from deep sensory fibers that supply the interosseous membrane and joint capsules

Question 29

What 2 muscles are innervated by the axillary nerve?

Answer 29

Deltoid (C5-6) and teres minor (C5-6)

Question 30

Palmaris Longus

Answer 30

C7, C8 Median