Page 543 - ONLINE PROCEEDING BOOK WSAVA 2017
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Table 1: Neurological examination function and tests of Cranial nerves
An Urban Experience
Cranial nerve
Function
Test
Elements involved in test
I Olfactory
SENSORY
-Conscious perception of smell
-Test if smell perception is present by e.g. hiding food
-Cell bodies in olfactory epithelium on ethmoturbinates
-2. order neurons in olfactory bulb
-3. order neurons in olfactory peduncle
and synapsing in piriform lobe olfactory area
II Optic
SENSORY Vision
-Menace response
-Afferent component through the visual pathway
-Efferent pathway involves the motor cortex, cerebellar structures and pathways to the facial nucleus/facial nerve
III Oculomotor
MOTOR
-Ipsilateral M dorsalis, ventralis & medialis recti & M obliquus ventralis
-Ipsilateral M levator palpebralis superior
PARASYMPATHETIC Pupil constriction
-Evaluate eye position -Physiological nystagmus
-Evaluate pupil size -Pupillary light re ex
Physiological nystagmus vestibular components +
fasciculus medialis lonitudinalis in brainstem + Oculomotor, Abducent and Trochlear nerves
Pupillary light re ex
-Optic nerve
-Midbrain (pretectal nucleus)
-Parasympathetic component of -Oculomotor (CNIII) nucleus
-Parasympathetic axons in Oculomotor nerve (CNIII)
IV Trochlear
MOTOR
-Contralateral M dorsalis obliquus
-Observe eye position -Physiological nystagmus
See Oculomotor nerve
V Trigeminal
MOTOR
-Masticatory muscles
SENSOR
-Sensation of face, cornea, nasal mucosa and tongue
-Evaluate muscle size and symmetry
Corneal re ex (ramus opthalmicus)
-Afferent: Trigeminus - Efferent: Facialis
Palpebral re ex
(ramus opthalmicus & maxillaris) -Afferent: Trigeminus
-Efferent: Facialis
Nasal mucosal stimulation (ramus opthalmicus)
-CN V sensor stimuli – thalamocortical response
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