Peripheral Nervous System

Question 1

Describe the clinical syndrome that would arise from a lesion in S1 root?

Answer 1

Sensory loss:
Posterior calf and lateral aspect of the foot

Motor loss:
Plantar flexion (aka foot drop)

Reflex:
Loss of ankle jerk

Question 2

Describe the clinical syndrome that would arise from a lesion in C5 root?

Answer 2

Sensory loss:
Lateral arm

Motor:
Shoulder abduction
Elbow flexion

Reflex:
Loss of biceps reflex

Question 3

Describe the clinical syndrome that would arise from median nn compression in carpal tunnel syndrome?

Answer 3

Sensory:
Parasthesia on the palmar aspect of the 1st 3 and a half digits.

Motor:
Wasting of pollicus brevis

Question 4

Describe the clinical syndrome that would arise from a ulnar nn palsy?

Answer 4

Sensory:
Affects medial 1.5 digits.

Motor:
Wasting/weakness of the hypothenar mm, interossei and medial 2 lumbricals

Question 5

Describe the clinical syndrome that would arise from a radial nn palsy?

Answer 5

Sensory:
Affects the dorsum of the hand.

Motor:
Weakness in the brachioradialis and finger extensors.
Leads to wrist drop.