Perioheral nerve lesions

Question 1

What is the middle finger dermatome?

Answer 1

C7

Question 2

What happens in Erbs palsy and what causes it?

Answer 2

damage to C5, C6 nerve roots

Excessive pulling of neck during child birth

Question 3

What are the symptoms of Erbs palsy?

Answer 3

waiters tip
adducted shoulder
medially rotated arm
extended elbow 
pronated forearm

Question 4

What happens in Klumkes palsy and what causes it?

Answer 4

damage to inferior trunk of brachial plexus (C8,T1- ulnar nerve)
Upper limb is pulled during childbirth
May also be associated with Horners syndrome

Question 5

What does Klumpkes palsy cause?

Answer 5

Paralysis of most of intrinsic muscles of the hand and ulnar flexors of the wrist and digits = claw hand
hyperextension at the metacarpophalangeal joints and flexion at the interphalangeal joints
Due to paralysed lumbricals of digits 4 and 5

Question 6

Cubital tunnel syndrome

Answer 6

compression of ulnar nerve
Caused by repetitive elbow flexion and extension
same symptoms as Klimpkes palsy + pain

Question 7

Horners syndrome?

Answer 7

Ptosis
miosis
anhidrosis 
vasodilation 
Sympathetic neurones supplying head originate from T1 and may be damaged in the same way as Klumpkes palsy

Question 8

Radial nerve palsy?

Answer 8

wrist drop - paralysis of extensors
triceps weakened not paralysed
radial nerve damage in spiral goove of the humerus

Question 9

Median nerve injury at elbow

Answer 9

damaged by supra condylar fractures or pronator teres syndrome
Supplied majority of forearm flexors but not FCulnaris and medial half of flexor digitorum profundus , thenar and lateral 2 lumbricals of the hand

Question 10

Hand of benediction

Answer 10

inability to flex digits 1-3

able to flex 4 and 5 weakly due to ulnar nerve