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CN Testing

Physiology Laboratory (Cranial Nerve Testing)

QuestionAnswer
Diabetic patients particularly those with long standing poor control may develop Peripheral nerve dysfunction
CN I Olfactory nerve
In CN I testing the patient should be able to identify its distinctive odor from approximately 10 cm
CN II Optic nerve
CN II carries visual impulses from the eye to the optical cortex of the brain through Optic tracts
CN II testing involves 3 phases Acuity, Visual field testing, Pupils
If the patient uses glasses uses glasses hen viewing distant object, they should be permitted to wear them referred to as the Best corrected vision
The standard, wall mounted device used for ACUITY assessment Snellen chart
Indicates normal vision using the snellen chart 20/20
Holes in vision referred as Visual field cuts
Caused by a disruption along any point in the path from the eyeball to the visual cortex of the brain Visual field cuts
This test is rather crude, and it is quite possible to have small visual field defect that would not be apparent on this type of testing Visual field testing
The pupil has -----that travel along with ------ Sensory (afferent) nerve CN 2
Pupil function in concert with ------that travel with----- Motor(efferent) nerve CN 3
The coordinated movements depends on-----that insert around the eyeballs and allow them to move in all direction 6 extra ocular muscles
Movement where pupils are directed upwards Elevation
Movement where pupils are directed downwards Depression
Movement where pupils are directed laterally Abduction
Movement where pupils are directed medially Adduction
Movement where top of the eyes are rotating away from the nose Extorsion
Movement where top of the eyes are rotating towards the nose Intorsion
CN IV controls what muscle Superior oblique m.
CN VI controls what muscle Lateral rectus m.
CN III controls what muscle Inferior oblique, superior rectus, inferior rectus, medial rectus
This CN also raises the eyelid and mediates constriction of pupil CN III
Function of lateral rectus m. Abduction
Function of medial rectus m. Adduction
Function of inferior rectus Depression, extorsion, adduction
Function of superior rectus Elevation, intorsion, adduction
Function of superior oblique Intorsion, depression, abduction
Function of inferior oblique Extorsion, elevation, abduction
When the finger is located directly towards the patient's nose, this will cause the patient to look cross eyed and the pupils constrict a response called Accommodation
Patient's will have double vision when they look in a direction that's affected Diplopia
When he looks right, his vision is normal; but when he looks left, he experiences double vision as the left eye can't move laterally referred as Horizontal diplopia
Muscle which raises the upper eyelid Levator palpebrae superioris muscle
If there is CN ---- dysfunction, the eyelid on that side will cover more of the iris compared with the other eye which is referred as Ptosis
The response of the pupils to light is controlled by Sensory (afferent) nerve that travel with CN 2 and motor (efferent) nerve that travel with CN 3
Muscle that controls the size of the pupil Ciliary muscle
If the room is dim, the pupils is more Dilated
When the pupil constrict with any light source, it is termed as Direct response
When the light is remove and then re-expose it to the same eye, it will constrict together with the other eye termed as Consensual response
CN IV Trochlear nerve
CN V Trigeminal nerve
CN V has what components Both sensory and motor
The sensory limb of CN V has major branches namely Ophthalmic, Maxillary and Mandibular
Outer white area of the eyeball Sclera
Blinking also requires CN ----- function normally as it controls eyelid closure CN VII
The motor limb of CN V innervates what muscle Masseter and temporalis muscle
Muscles that are important for closing the jaw Temporalis and masseter muscle
CN VI Abducens nerve
Created by: analyncosim