Accepted at 2:11 a.m. Oct, 19, 2023 by Cameron
Author: HFR4
Co-authors: Cameron
Related Note: 1480640109659
Rationale for change

made a mnemonic, may help

Extra Extra
Text
CN {{c2::IV (trochlear)}} contributes to eye movement via innervation of the {{c1::superior oblique}} muscle
Lecture Notes
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Missed Questions
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Pathoma
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Boards and Beyond
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First Aid
Sketchy
*Picture the impressive (superior) obliques on Thor in the sketch (not actually pictured but maybe helpful)*



Watch Cranial Nerves III, IV, and VI (Oculomotor, Trochlear, and Abducens)
Sketchy 2
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Picmonic
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Pixorize


Review Trochlear Nerve (CN IV)
Physeo
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Bootcamp
Watch associated Bootcamp video - Cranial Nerves 1-6: Cranial Nerve IV
OME

Additional Resources

Trochlear nerve palsy
Trochlear nerve palsy causes impairment of ipsilateral eye abduction. The eye may appear slightly elevated on examination as the inferior muscles predominate, which also causes a mild diplopia. The patient may appear to have a contralateral head tilt as they attempt to compensate for this diplopia.



Trochlear nerve palsy
Center: The internal rotation of the eye is missing with a Trochlear nerve palsy. Through the preponderance of the antagonist (inferior oblique muscle), the concerned eye is rotated to the outside and drifts upwards slightly (hypertropia).
Right (increased hypertropia): The highest squint deviation occurs when the head is tilted to the side of the paretic muscle, as the eyeball drifts upwards and inwards (Trochlear nerve palsy).
Left (compensating posture of head): Compensatorily, the patients often tilt their head to the opposite side.

One by one
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#AK_Step1_v12::#Physeo::03_Physiology::08_Neuro::10_Ophthalmology #AK_Step1_v12::^Systems::Neuro::CranialNerves #AK_Step1_v12::#Physeo::03_Physiology::08_Neuro::04_Cranial_Nerves_-_Part_1 #AK_Step1_v12::#OME::Clinical::04_Organ_Systems::08_Neuroscience::02_Motor_&_Sensory_Tracts::05_Cranial_Nerves #AK_Step1_v12::#B&B::15_Neuro::02_Nervous_System_Structures::05_Cranial_Nerves #AK_Step1_v12::#SketchyAnatomy::01_Head_&_Neck::01_Cranial_Nerves::03_Cranial_Nerves_III_IV_&_VI_(Oculomotor_Trochlear_&_Abducens) #AK_Step1_v12::#OME::04_Organ_Systems::08_Neuroscience::04_Special_Senses::02_The_Eye_Retina #AK_Step2_v12::Original_decks::Zanki_Step_2::Neuro::Step_1_Neuro #AK_Step2_v12::#AMBOSS::lM0vKg #AK_Step2_v12::#Resources_by_rotation::Neuro::step1_neuro::step_1_neuro_zanki !AK_UpdateTags::Step1decks::Zanki-Step-Decks::Zanki-Neurology::Kaplan-Neuroscience #AK_Step2_v12::!Shelf::Neuro::no_dupes #AK_Step1_v12::#OME::04_Organ_Systems::08_Neuroscience::02_Motor_&_Sensory_Tracts::05_Cranial_Nerves #AK_Step1_v12::#Physeo::03_Physiology::08_Neuro::05_Cranial_Nerves_-_Part_2 #AK_Step1_v12::^Other::^HighYield::3-HighYield-temporary #AK_Step1_v12::^Systems::Neuro::neurology #AK_Original_Decks::Step_1::Zanki_Step_Decks::Zanki_Neurology::Kaplan_Neuroscience #AK_Step1_v12::#Pixorize::05_Neuroanatomy::01_Cranial_Nerves::04_Trochlear_Nerve_(CN_IV) #AK_Step1_v12::#AMBOSS::2VaTFj #AK_Step1_v12::^Systems::Neuro::KaplanNeurology::unorganized #AK_Step1_v12::^Systems::Neuro::brainstem #AK_Step1_v12::#FirstAid::12_Neurology_and_Special_Senses::02_Anatomy_and_Physiology::33_Cranial_nerves::*CN_04_Trochlear_Nerve #AK_Step1_v12::#Bootcamp::Neurology::13_Cranial_Nerves_1-6::04_Cranial_Nerve_IV !AK_UpdateTags::AnKing_Image::Aiman #AK_Step1_v12::#FirstAid::12_Neurology_and_Special_Senses::05_Ophthalmology::14_Ocular_motility::*Superior_Oblique