where in the pns

Question 1

PNS pathway

Answer 1

roots
plexus
nerves

NMJ
muscle
(lesion in NMJ and muscle is not complete, only partial weakness - reflexes remain normal)

Question 2

NMJ lesion

Answer 2

proximal weakness*: cause proximal muscles exert
more force - affected the most 
(cause weakness in climbing stairs)
wasting/ pseudohypertrophy
no sensory symptoms

Question 3

muscle lesion

Answer 3

no wasting nor fasciculations

proximal: movements about shoulder/hip will be affected, ankle/wrist ok

Question 4

nerves lesion

Answer 4

long nerves more vulnerable

distal glove and stocking distribution* of weakness/numbness + senosry loss

Question 5

causes of neuropathies

Answer 5

diabetes
B12 deficiency
Guillain Barre syndrome

Question 6

mononeuropathies

Answer 6

damage to single nerve: median/radial/ulnar; sciatic/femoral

Question 7

M1 revision: median nerve

Answer 7

LOAF muscles: lumbricals, opponens pollicis, abductor pollicis brevis, flexor pollicis brevis
sensory to 1st 3.5 digits
carpal tunnel syndrome

Question 8

M1 revision: radial nerve

Answer 8

extensors (wrist drop) + brachoradialis (supination problem)
sensory to anatomical snuffbox
saturday night palsy - lying on stretched hand to sleep

Question 9

M1 revision: ulnar nerve

Answer 9

hypothenar muscles
sensory to last 1.5 digits
cubital tunnel/ FOOSH

Question 10

M1 revision: sciatic nerve

Answer 10

hamstrings
adductors
forms tibial (plantarflexion) and common fibular nerve (dorsiflexion) 
sensory for tibial and cfn also 
caused by intra-pelvic compression 

foot drop - cause of affected dorsiflexion
weak plantarflexion
weak hip flexion