Brachial plexus

Question 1

What are the sections of the brachial plexus?

Answer 1

• 5 roots (C5-T1)
• 3 trunks (sup/mid/inf)
• 6 divisions (3x ant, 3x post)
• 3 cords (lat/post/med)
• 5 terminal branches (musculocutaneous, median, axillary, radial, ulnar)

Question 2

What roots make up the superior trunk?

Answer 2

C5 & C6

Question 3

What root makes up the middle trunk?

Answer 3

C7

Question 4

What roots make up the inferior trunk?

Answer 4

C8 & T1

Question 5

What contributes to the dorsal scapular nerve?

Answer 5

C5

Question 6

Which roots contribute to long thoracic nerve?

Answer 6

C5-7

wings of heaven

Question 7

What contributes to the lateral pectoral nerve?

Answer 7

C5-7 (lat cord)

Question 8

What contributes to the upper subscapular nerve?

Answer 8

C5 (post cord)

Question 9

What contributes to the thoracodorsal nerve?

Answer 9

C6-8 (post cord)

Question 10

What contributes to the lower subscapular nerve?

Answer 10

C6 (post cord)

Question 11

What contributes to the suprascapular nerve?

Answer 11

C5 & C6 (sup trunk)

Question 12

What contributes to the medial pectoral nerve?

Answer 12

C8 & T1 (med cord)

Question 13

Which roots contribute to the musculocutaneous nerve?

Answer 13

C5-7

Question 14

Which roots contribute to the median nerve?

Answer 14

C6-T1

Question 15

Which roots contribute to the ulnar nerve?

Answer 15

C8 & T1

+C7 in some

Question 16

Which roots contribute to the axillary nerve?

Answer 16

C5+6

Question 17

Which roots contribute to the radial nerve?

Answer 17

C5-T1

Question 18

What artery do the lat/med/post cords surround?

Answer 18

Axillary artery

Question 19

What structures are innervated by the musculocutaneous nerve?

Answer 19

Motor - all muscles in the anterior compartment of the arm

Sensory - skin on lateral side of forearm

Question 20

What structures are innervated by the axillary nerve?

Answer 20

Motor - deltoid, teres minor

Sensory - skin over upper lateral part of arm

Question 21

What structures are innervated by the median nerve?

Answer 21

Motor - all anterior forearm muscles (except FCU and med 1/2 flexor digitorum profundus), thenar muscles, & 2 lat lumbricals
Sensory - skin on palmer lat 3 1/2 digits

Question 22

What structures are innervated by the radial nerve?

Answer 22

Motor - all post arm and forearm muscles

Sensory - skin on post arm and forearm, and dorsal lat hand

Question 23

What structures are innervated by the ulnar nerve?

Answer 23

Motor - all intrinsic hand muscles (except thenar and lat 2 lumbricals), and FCU&flexor digitorum profundus in forearm
Sensory - skin on palmar&dorsal med 1 1/2 digits