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CN Testing
Physiology Laboratory (Cranial Nerve Testing)
| Question | Answer |
|---|---|
| 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
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