Refelxes and cranial nerves and dermatomes

Question 1

Patella reflex arc

Answer 1

Mainly l4

But l2, l3 too

Question 2

Achilles tests which nerveroot

Answer 2

S1/s2

Mainly s1

Tibial nerve

Question 3

how to test optic

Answer 3

1. light refelx (afferent)
2. snellen visual acuity
3. visual fields (eyes on nose)
4. accomodation reflex - pupils should converge and constrict

Question 4

how to test cn3

Answer 4

draw a H - always ask for double vision

pupil reflex direct and indirect

ptosis - levato palpebrae

Question 5

trochlear inneverates

Answer 5

superior obllique

Question 6

if lateral rectus doesnt work the eye will be

Answer 6

medial

Question 7

if cn3 palsy the eye will be

Answer 7

lateral and down(as superior oblique still works )

ptosis
pupil dilated

Question 8

testing trigeminal

Answer 8

v1,v2,v3 cotton wool +pin prick
does it feel the same on both sides?

muscles of mastication

clench jaw (masseter) and relax should feel tension

open mouth and try to stop me from closing mouth

and opposite try to open mouth with a bit of resistance

jaw jerk reflex

Question 8

testing CN7

Answer 8

puff out cheeks
pout
wrinkle eyebrows
smile
close and oen eyes dont let me open them

Question 8

in bells palsy where is the lesion

Answer 8

on the same side its a lower motor neuron

Question 9

signs of facial nerve dysfunction

Answer 9

dry mouth - parasymaptheitc innervation to salivary
dry eyes - parasympathetic lacrimal g
cant close eyes
hearing
anterior 2/3rds tongue