Brachial plexus

Question 1

Median root nerve

Answer 1

C5,6,7,8,T1

Question 2

long thoracic

Answer 2

C5, C6, C7

Question 3

Dorsal scapular

Answer 3

C5

Question 4

Name the Cords?

Answer 4

Lateral cord (preaxial) C5-C7 roots 
Medial cord (preaxial) C8-T1 roots 
Posterior cord (postaxial) C5-T1

Question 5

Suprascapular

Answer 5

C5; some C6

Question 6

Subclavius

Answer 6

C5&C6

Question 7

What is erbs palsy?

Answer 7

damage to the upper roots of brachial plexus. either by pulling or fall or birth. C5 & C6 is damaged bad traction so is C7

Question 8

What are the symptoms of erbs palsy?

Answer 8

arms hang limp by side
can’t abduct, medial rotate arm
arm and forearm extended

Question 9

What muscles are affected by Erbs palsy?

Answer 9

any muscle that is innervated by C5 & C6

if C7 affected triceps may be paralyzed

Question 10

What is Klumps palsy?

Answer 10

damage to T1 of brachial plexus, sometime C8 and C7

Question 11

What are the symptoms of Klumpes palsy?

Answer 11

Loss of intrinsic muscles of hand, particularly the interosseus muscles (also thumb and hypothenar MM)Hand “clawed”; extended at MP joint, flexed at IP joints
Anesthesia along medial part of arm (T1 dermatome)
Often involves injury to C7 & C8, where there will be loss of most digital flexors and extensors; hand motion weak if it exists at all

Question 12

What is prefixed brachial plexus?

Answer 12

When C4 makes a contribution to brachial plexus

Question 13

What is post fix brachial plexus?

Answer 13

when T2 makes a contribution to the brachial plexus

Question 14

What is thoracic outlet syndrome?

Answer 14

compression of structure going through the cervicoaxillary space

Question 15

What causes thoracic outlet syndrome?

Answer 15

Muscle hypertrophy due to weight lifting; e.g., hypertrophy of scalene muscles
Developmental abnormality, e.g., cervical rib
Tumor at base of lung, e.g., Pancost tumor
Trauma

Question 16

name the structures going through the cervicoaxillary space from posterior to anterior?

Answer 16

Middle scalene mm
brachial plexus
suclvian artery
anterior scalene muscles

Question 17

What nerves branch from lateral cord?

Answer 17

Lateral pec
musculocutaneous
lateral root of median

Question 18

What are the nerve roots of lateral cord nerves?

Answer 18

C5,
C6
C7

Question 19

What are the nerve branches of medial cord?

Answer 19

Medial pec 
medial brachial cutaneous 
medial antebrachial cutaneous 
ulnar 
medial root of median

Question 20

What are the nerve roots of medial cord nerves?

Answer 20

C8
T1
Ulnar(C7)

Question 21

What are the nerve branches of the posterior cord?

Answer 21

upper/middle/lower sub scapular
Axillary
radial

Question 22

What is the nerve root of posterior cord?

Answer 22

C5
C6
Radial (7,8, T1)
middle sub scapular (7,8)