USMLE Step 1 Tutorial - Conjugate Gaze Explained

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UNDERSTANDING THE CONJUGATE GAZE. If you're preparing for the Step 1 exam, you know the importance of understanding the conjugate gaze.
In this video I’m going to discuss the basics of understanding the conjugate gaze. This is a super high-yield Step 1 topic, so be sure to watch it a few times until you completely understand.
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Опубликовано:

24 июл 2013

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Комментарии : 41

@oliversykez7292 8 лет назад

Wonderful explanation in a very short time! Thank you!

@blacktongs 3 года назад

New favourite channel! Thank you!

@reuelpn 6 лет назад

Fantastic explanation ! Really appreciate it !

@btirador 8 лет назад

very concise and helpful. thank you!

@moathalmosa3918 9 лет назад

Thanks a lot, your explanations were really helpful.

@89tees 8 лет назад

Thanks for this sweet video!

@margaretprawl313 9 лет назад

Thank you Doc. I am a nursing student . My name is Junior. Needed something simple but efficient to help me in my nursing assessment of people with alcoholic toxicity as reflected in palsies of the eye. Your video lets me understand what I am looking for and why it happens. Wish I had you as a tutor in Nursing school.

@mandanamashoof3015 8 лет назад

Thanks for the great explanation.

@khalidthego 6 лет назад

Great video, Thank you so much

@Ani.DR.07 7 лет назад

crystal clear concept s . thanks

@oksanajames7960 7 лет назад

Thank you so much !!

@jayvanithakurgarcia9386 9 лет назад

very clear!

@siddharthakancharla1954 10 лет назад

Thanks ... It was very help full

@barrythompson1122 10 лет назад

Excellent explanation

@yztyzt1 9 лет назад

u r a god of explanation! Holy shiit ur good at the usmle! In fact, I am not even studying the USMLE. Instead, I am studying for the specialty boards of ABPN. And I am still using your vid to study the neuro section. u r a god.

@nomankhallid 8 лет назад

Thank you so much.

@mohammadhamadneh3611 5 лет назад

Incredible video

@achinisamaranayake8546 10 лет назад

Thank you!

@homahealthcarecenter 3 года назад

in gazepalsy, first rule is individual eye ball movements should be normal. first check single each eye seperately,then go for gaze movements

@ForeignDoc 8 лет назад

Very good but you should include in your diagram/explanation - the frontal eye field (broadmann area 8) and PPRF (you did mention reticular formation however)

@chunkymonkey2782 7 лет назад

i still don't get what the PPRF does

@muthuswamin1047 7 лет назад

The PPRF is the reticular formation he is talking about in the video.PPRF= Paramedian pontine reticular formation.To look to the left,the right frontal eye field sends impulses to the left paramedian reticular formation. The left PPRF sends impulses to left (ipsilateral) 6th nerve nucleus and it stimulates left lateral rectus causing abduction to left side.Simultaneously the 6th nerve nucleus sends impulses via right medial longitudinal fasciculus to right 3rd nerve nucleus.The right 3rd nerve nucleus innervates the right medial rectus causing adduction of the right eye.Therefore left eye abducts and right eye adducts resulting in horizontal gaze to the left.

@diendamadick9184 4 года назад

@@muthuswamin1047 Bottom line: MLF lesion = no medial movement of ipsilateral eye, positive lateral movement of contralateral eye PPRF lesion = no lateral movement of ipsilateral eye, no medial movement of contralateral eye

@RobinahJuru1992 7 лет назад

Thanks heaps for this :)

@JOHNNIEUSA 2 года назад

great video

@joyoluchukwu6397 7 лет назад

thanks

@Michael44413 4 года назад

Thank you

@AsifKhan-fh2om 3 года назад

Awesome ..

@ATA-wi2lh 5 лет назад

can you do vertical conjugate gaze?

@SteezySteez2011 5 лет назад

I've seen patients + for hemorrhagic stroke with conjugate gaze, is this a result of blood accumulating within the cranium, and applying pressure on CN6?

@lailalu8714 4 года назад

Best

@gunabharathi3152 6 лет назад

Why opposite side nystagmus formed?

@positivevibes7425 6 лет назад

What is the role of Broddmann's 8 area in this pathway?

@davebuikema4119 6 лет назад

That ignites this pathway. It is the initiator. Broddmann's 8 is also known as the FEF. Frontal Eye Field. The FEF (Brodman 8) on the Right sends impulse to the PPRF (reticular formation) on the Left. To recap: R FEF --> L PPRF. L PPRF sends impulse to L Abducens Nucleus (CN 6 Nuc). This does NOT cross! So to recap: R FEF --> L PPRF --> L CN6 Nuc. L CN6 Nuc innervates L Lateral Rectus. L CN6 Also sends an impulse via the R MLF to the R CN3 Nucleus. To recap: L CN6 --> L lat. rectus and R MLF. R MLF carries to R CN3 Nuc. R CN3 Nuc innervates R Medial Rectus. Once you understand this you can kind of rationalize what the symptoms would be based on the location of the lesion. Another useful thing to note: If the nucleus or the nerve itself is damaged, the associated muscle will atrophy! So if the patients R lateral rectus is atrophied, you can consider the R CN6 and its nucleus to be lesioned. This is useful for differentiating between scenarios where the only difference between "scenario 1" and "scenario 2" is an atrophic condition of the muscle. Hope this helps!