Brachial Plexus

Question 1

Brachial Plexus

Answer 1

5 Roots (C5-T1)
3 Trunks (superior, middle, inferior)
6 Divisions (each trunk into anterior and posterior)
3 cords (lateral, medial, posterior)
5 terminal branches

Question 2

5 roots give off what nerves?

Answer 2

Dorsal scapular (C5)
Phrenic (C3,4,5)
Long Thoracic (C5,6,7)

Question 3

Superior Trunk

Answer 3

Union of C5 and C6

Question 4

Superior trunk gives off what nerves?

Answer 4

Subclavius (C5)

Suprascapular (C4,5,6)

Question 5

Middle Trunk

Answer 5

Continuation of C7

Question 6

Inferior Trunk

Answer 6

Union of C8 and T1

Question 7

Anterior Division

Answer 7

Innervates flexor muscles

Question 8

Posterior Division

Answer 8

Innervates extensor muscles

Question 9

Lateral Cord

Answer 9

Union of anterior division of superior and middle trunks

Carry C5,6,7 fibers

Question 10

What branches off the lateral cord?

Answer 10

Lateral pectoral (C5,6,7)

Question 11

Medial Cord

Answer 11

Continuation of anterior division of inferior trunk

Carry C8 and T1 fibers

Question 12

What branches off the medial cord?

Answer 12

Medial pectoral (C8-T1)
Medial cutaneous of arm (C8-T1)
Medial cutaneous of forearm (C8-T1)

Question 13

Medial cutaneous of arm provides sensation where?

Answer 13

Medial side of arm

Superior part of forearm

Question 14

Medial cutaneous of forearm provides sensation where?

Answer 14

Medial side of forearm

Question 15

Posterior Cord

Answer 15

Union of all three posterior divisions

Carry C5-T1 Fibers

Question 16

What branches does the posterior cord give off?

Answer 16

Upper subscapular (C5,6)
Thoracodorsal (C6,7)
Lower sub scapular (C6,7)

Question 17

5 Terminal Branches

Answer 17

Axillary - posterior cord
Musculocutaneous - lateral cord
Median - lateral and medial cord
Radial - posterior cord
Ulnar - medial cord

Question 18

What clinical sign comes from superior BP injury?

Answer 18

Erb’s palsy - separation of head and neck with fall, stretching during baby delivering

Question 19

What clinical sign comes from inferior BP injury?

Answer 19

Claw hand

Sudden pull of arm superiorly trying to grab something

Question 20

What clinical sign comes from median nerve injury?

Answer 20

Pronator syndrome

Hand of benediction

Question 21

What clinical sign comes from radial nerve injury?

Answer 21

Wrist drop

Question 22

What clinical sign comes from a biceps tendon rupture?

Answer 22

Popeye deformity

Question 23

What is the clinical sign of Erb’s palsy?

Answer 23

Waiter’s tip

Question 24

What is in the triangular space?

Answer 24

Circumflex scapular artery

Question 25

What is in the quadrangular space?

Answer 25

Axillary

Posterior circumflex humeral

Question 26

What is in the triceps hiatus?

Answer 26

Radial nerve

Question 27

Thumb abduction test what nerves?

Answer 27

Median

Radial

Question 28

Thumb adduction test what nerve?

Answer 28

Ulnar

Question 29

Thumb extension test what nerve?

Answer 29

Radial

Question 30

Thumb flexion test what nerve?

Answer 30

Median

Question 31

Thumb opposition test what nerve?

Answer 31

Median

Question 32

Cubital fossa contains

Answer 32

Terminal branch of brachial artery
Radial/ulnar arteries
Biceps brachii tendon
Median nerve
Radial nerve branches