CN VI palsy is the classic false localizing sign.
Raised ICT from a frontal lobe mass may cause it, even though CN VI mostly lies in the posterior fossa.
Learn how it happens
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CN VI palsy is the classic false localizing sign.
Raised ICT from a frontal lobe mass may cause it, even though CN VI mostly lies in the posterior fossa.
🔗🎧https://t.co/WG341FiITN #MedEd#ClinicalSigns
🔗✍️https://t.co/quxAr8aeWq
🔍 New article on the Abducens Nerve — a deep dive into the anatomy, course, and clinical relevance of CN VI!
📌 From Dorello’s canal to cavernous sinus, understand where and how it can go wrong.
🧠 Read here: https://t.co/quxAr89H6S
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🧠 Dorello's canal
Gruber’s ligament forms the roof of Dorello’s canal, while the petrous temporal bone forms the floor.
This canal carries the abducens nerve & can be compressed in raised ICP or trauma.
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Clinical features of SO palsy
💡Some patients won't have diplopia and will complain of blurring of vision when looking down and to the opposite side.
💡To avoid diplopia, patients tilt their heads to the opposite side.
Superior oblique muscle action.
💡 When the eye is abducted and in a neutral position, the superior oblique is a strong intorter
💡When the eye is adducted, it is a depressor.
💡Its tertiary action is the abduction of the eye.
#Neurology#Anatomy#neuroophthalmology
Clinical features of SO palsy
💡The patients usually complain of binocular diplopia with vertically separated images.
💡The diplopia will be more when looking down and to the opposite side, which is the action of the ipsilateral superior oblique
Clinical examination of intorsion
💡Focus on a capillary on the limbus at around 12 o'clock position and ask the patient to look at the tip of the nose.
💡The capillary is supposed to move clockwise in the right eye and anticlockwise in the left eye if the intorsion is normal.
Bielschowsky 3-Step Test
🩺Diagnosing vertical strabismus?
💡Use the 3-step test to isolate the weak muscle.
✍️Read more at https://t.co/Vb8xKiu2LH
🎧Hear at https://t.co/3ipTXVqFVt
🔬 Bielschowsky 3-Step Head Tilt Test
Diagnosing vertical strabismus?
Use the 3-step test to isolate the weak muscle.
It’s perfect for trochlear palsy detection. Learn more at
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✍️🔗https://t.co/Vb8xKiu2LH
#NeuroOphthalmology#ExamSkills#Neurology
Park-Bielschowsky 3-Step Test
🩺Diagnosing vertical strabismus?
💡Use the 3-step test to isolate the weak muscle.
Read more at https://t.co/Vb8xKiu2LH
Hear at https://t.co/1y6ssvpu9I
#NeuroOphthalmology#ExamSkills#Strabismus
A 60-year-old female presented with slurring of speech for one day.
1. What is the clinical finding?
2. What causes the tongue to deviate to the left on protruding and to the right while inside the mouth?
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The oculomotor nuclear complex
💡The superior rectus subnucleus is unique as it supplies the contralateral eye.
💡Damage to one side can lead to bilateral superior rectus weakness.
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✍️🔗https://t.co/FQmsYt8jO7
#neurology#ophthalmology