Cranial nerves 2

PLT - NEURO - Cranial nerves clinical review RTB RCSI NOV 09

The Cranial nerves

Two of each of the twelve cranial nerves!Position the patient sitting over the edge of the bed.Look at the head, face and neck.Inspection

Craniotomy scars

Ptosis drooping of the upper eyelid

Proptosis abnormal protrusion of the eyeball

CN I

CNIIVisual acuity

Visual fields Bitemporal hemianopia: Unilateral field loss:

Homonymous hemianopia: CN III, IV, VIThe pupils: E________-W_________ nucleus of the third nerve. stimulation causes papillary ____________]Light reflex: direct light reflex

consensual light reflex Accomodation:

Eye movements The third nerve supplies all the ocular muscles except;1. _____________ 2._____________Muscle movementsmedial rectus (MR) ______________lateral rectus (LR) _______________superior rectus (SR) _____________inferior rectus (IR) ______________superior oblique (SO) ____________inferior oblique (IO) _____________CN V - Facial sensation

1.

2.

3.Motor division Muscles of ______________ CN VIISupplies: The muscles of facial expression

Stapedius muscle

Chorda tympani contains taste fibres from _________________________________Inspection: for facial asymmetry1. Unilateral drooping of the corner of the mouth2. Smoothing of the wrinkled forehead3.Smoothing of the nasolabial foldMuscle power:Muscles of facial expression

CN VIII

Cochlear for hearingVestibular for balanceIf deafness is suspected perform Rinnes test Audiometry

CN IX, X- inspect the palate & note any displacement of the uvula. Now test for the gag reflexNinth is the sensory component Tenth is the motor componentCN XI Motor fibres to __________ & ______________ CN XII- Motor nerve of __________ Email: robertthomasbrady@rcsi.ie