Fourth Nerve Palsies | Animation | Explained Conceptually

An animated analogy to explain why vertical and torsional diplopia occurs in unilateral and bilateral 4th (trochlear) nerve palsies, and how to diagnose it at the bedside using Bielschowsky's head tilt test.
Link to extraocular muscle actions video mentioned: • Extraocular Muscle Act...
Timecodes
0:00 - Intro
0:25 - Analogy breakdown
0:46 - Resting extraocular muscle actions
1:03 - Torsional eye movements
1:46 - Patient's perspective
2:21 - Normal rightward head tilt
2:38 - Eye intorters (Superior oblique and rectus)
3:09 - Eye extorters (Inferior oblique and rectus)
3:54 - Normal leftward head tilt
4:13 - Ocular counter-rolling
4:40 - Trochlear nerve
4:55 - Superior oblique actions
5:02 - Superior oblique palsy
6:06 - Vertical + Torsional diplopia
6:31 - Right 4th nerve palsy with rightward head tilt
7:08 - Positive Bielschowsky head tilt test
7:22 - Right 4th nerve palsy with leftward head tilt
8:13 - Habitual head tilting
8:45 - Right 4th nerve palsy with a leftward gaze
9:32 - Arrow sign
10:01 - Bilateral 4th nerve palsy
11:09 - Bilateral 4th nerve palsy with rightward head tilt
11:19 - Bilateral 4th nerve palsy with leftward head tilt
11:27 - Positive Double Bielschowsky head tilt test
11:50 - Summary
#EndNeurophobia

[@NeurologyAnalogy]

I hope you found this analogy helpful :)
If you have any ideas for neurology concepts you would like an animated analogy for, let me know below and I'll add them to my list!

[@onemoreguyonline7878]

I would say I stumbled upon the weird part of the internet, but this is probably just the smart part of RUclips. What up other algorithm surfers

[@NeurologyAnalogy]

smart but hopefully understandable :)

[@vishu339339339]

Awesome!

[@NeurologyAnalogy]

thank you! very nice of you to say :)

[@Prajja_bhairava_vlog]

I’m facing same issue please help 😢😢

[@user-mf8zt8vh4n]

Low voice