Damage to brachial plexus

Question 1

what is damage to the superior trunk called?

Answer 1

Erb-duchenne paralysis

Question 2

what occurs when the superior trunk is damaged?

Answer 2

Downward displacement of arm (usually violent)
➢ Thrown off moving vehicle
Tear of C5-C6 roots

Question 3

what is the effect of damage to the superior trunk?

Answer 3

pts lose fx of all nerve that receive contributions from anterior + posterior divisions of the upper trunk

Loss of abduction, external rotation, radial flexion

cause damage to lateral pec nerve

Question 4

what occurs during root damage?

Answer 4

Nerve-root compression (while sleeping)

Trauma to roots which produces paralysis

Question 5

what is damage to the middle trunk called?

Answer 5

Klumpke paralysis

Question 6

how does middle trunk damage occur?

Answer 6

Very rare, only when someone is try to block scalene muscle with anesthetic and accidentally hitting middle trunk

Question 7

what occurs during middle trunk damage?

Answer 7

Violent upward displacement of arm during breached delivery
➢ Shoulder dislocation
➢ Apical tumor: Tumor of lungs pushing on trunk
➢ Cervical rip C7

Question 8

what is the effect of middle trunk damage?

Answer 8

loss of fx from all nerves that derive from anterior + posterior divisions of lower trunk

Loss of ulnar flexion of wrist, intrinsic muscles of the hand + wrist

Question 9

where does cord damage usually occur and why?

Answer 9

Mostly posterior cords bc they stand alone

Question 10

what is Injury to entire posterior cord called?

Answer 10

saturday night palsy

Question 11

what is the effect of cord injury?

Answer 11

loss of extension of all posterior arm muscles