Nerves/Dermatome

Question 1

Long thoracic n

Answer 1

Innervates serratus posterior inferior
Branches off C5-C7

Question 2

N to subclavius

Answer 2

Innervates subclavius
Branches of superior trunk

Question 3

Suprascapular n

Answer 3

Innervates infraspinatus and supraspinatus
Branches off superior trunk

Travels under superior transverse ligament
Artery travels over

Travels through spinoglenoid notch to innervate infraspinatus

Question 4

Upper subscapular n

Answer 4

Innervates subscapular
Branches off posterior cord

Question 5

Lower subscapular n

Answer 5

Innervates subscapular, teres major
Branches off posterior cord

Question 6

Thoracodorsal n

Answer 6

Innervates latissimus dorsi
Branches off posterior cord

Question 7

Radial n

Answer 7

Motor - posterior and forearm

Sensory - lower lateral and posterior arm, posterior forearm, lateral dorsum (1-3.5)

Branches off posterior cord, travels through triceps hiatus with profound brachii

At elbow splits into superficial and deep branches, contributes to deep palmar arch

At supinator, becomes posterior interosseous

Question 8

Axillary n

Answer 8

Motor - deltoid and teres minor

Sensory - upper arm/under shoulder

Branches off posterior cord (C5-C6)

Travels quadrangular with posterior circumflex humeral a.

Question 9

Lateral pectoral n

Answer 9

Innervates pectoralis major
Branches off lateral cord

Question 10

Musculocutaneous n

Answer 10

Motor - anterior arm
Sensory - lateral forearm
Branches off lateral cord

Question 11

Lateral root of median n

Answer 11

Branches off lateral cord

Question 12

Medial pectoral n

Answer 12

Innervates pectoralis major and minor

Branches off medial cord

Question 13

Medial root of median n

Answer 13

Branches off medial cord

Question 14

Medial brachial n

Answer 14

Sensory = medial arm
Branches off medial cord

Question 15

Medial antebrachial n

Answer 15

Sensory = medial forearm
Branches off medial cord

Question 16

Ulnar n

Answer 16

Motor - most of hand, medial FDP, flexor carpii ulna’s
Sensory - medial palm (3.5-5)

Branches off medial cord (C8-T1), travels medially down arm, behind elbow; goes DEEP thru wrist - becomes COMMON then PROPER in fingers

Question 17

Posterior interosseous n.

Answer 17

Innervates posterior forearm
Branches of radial n @ supinator

Question 18

Anterior interosseous n.

Answer 18

Innervates deep anterior forearm
Branches off median nerve @ cubital fossa

Question 19

Median nerve

Answer 19

Motor - anterior forearm, lumbricals 1&2, pronator teres
Sensory - lateral palm, 1-3.5

Lateral and median cord (C6-T1), travels anteriorly, becomes anterior interosseous @ cubital fossa

Question 20

Accessory n

Answer 20

Innervates trapezius
Spinal nerve

Question 21

Supraclavicular n

Answer 21

Sensory = top of shoulder and clavicle area

Question 22

Intercostobrachial n

Answer 22

Sensory = medial arm, near ribs

Question 23

Dorsal scapular n

Answer 23

Branches off C5-C6
Innervates rhomboids and levator scapulae