CN Testing

Question 1

CN 1: name? S/M? Test?

Answer 1

Olfactory - sensory (smell)
-pt closes eyes and plugs one nostril
-place smell under pt’s nose and ask “can you smell that?” If yes, “can you ID the scent?”

Question 2

CN 2: name? S/M? Tests?

Answer 2

Optic - sensory (vision)
Visual acuity: cover one eye and have pt read smallest line on Snellen chart

Visual fields: cover one eye and PT moves fingers. Pt lets you know when they see it and how many fingers

Pupillary response: shine light and see if pupil constricts or dilates

Question 3

What is an L1 pupillary response lesion?

Answer 3

Ipsilateral CN 3; direct response

Question 4

What is a L2 pupillary response lesion?

Answer 4

Contralateral CN 3, consensual response (pupil on opposite side dilates)

Question 5

What is a L3 pupillary response lesion?

Answer 5

Ipsilateral CN 2, both direct and consensual responses (both pupils dilate?)