+Sarah Colman Thank you Sarah - that is a very useful and valuable learning point. I will be sure to incorporate this into a new video later in the year.
The afferent sensory signals are transmitted by the trigeminal nerve to the brain stem; the efferent signals go to the orbicularis oculi muscle via the facial nerve, causing the muscle to reflexively contract, yielding blinking.
"If tapping were to then be made to persist, in cognitively intact individuals this would lead to habituation and consequent suppression of blinking. If instead the blinking were to persist along with the tapping, this is known as Myerson's sign, and is abnormal and a sign of frontal release; it is often seen in people who have Parkinson's disease" - hope this helps.
Emil Heilmanm Sørensen Yes even I had read something like that.. Due to issues with frontal lobe... And also its said that its primitive reflex.. integrates if myelination occurs.... I'm just assuming that may be demylination may lead to reoccurrence of this sign
You are supposed to have your hand come from above so they do no see it repeatedly.
+Sarah Colman Thank you Sarah - that is a very useful and valuable learning point. I will be sure to incorporate this into a new video later in the year.
Thank you doc 🙌
You don't tap from the front.Instead go from above downwards.Else any anxious patient may have positive reflex.
Thanks for highlighting this.
I am becoming a doctor thanks to youtube. I just finished aeronautic engineering last week.
Lol this test is very old, no one use it any more
The first few taps should illicit a shutting of the eyes. It is not necessary that the first tap does nothing
can you explain why does this response happen?? thank you!
The afferent sensory signals are transmitted by the trigeminal nerve to the brain stem; the efferent signals go to the orbicularis oculi muscle via the facial nerve, causing the muscle to reflexively contract, yielding blinking.
Thanks
If a person keep on blinking during glabellar tap but he or she is not blinking fully,is it still consider glabellar tap positive?
"If tapping were to then be made to persist, in cognitively intact individuals this would lead to habituation and consequent suppression of blinking. If instead the blinking were to persist along with the tapping, this is known as Myerson's sign, and is abnormal and a sign of frontal release; it is often seen in people who have Parkinson's disease" - hope this helps.
Subject is "Glabelar refleks" just, without elaboration, excellent presentation.
Thank you
May I know what leads to abnormality of this reflex..
Parkinson's
Parkinson's
Parkinsons
Positive glabellar reflex is what sign again? Please I didn't get that part
Sorry for the late reply - it may have changed now. I applied over 7+ years ago
I think it's better if you don't let them see your hand.
ran0010 Thanks for this helpful comment. We will try re-film this video later in the year
The examiner is supposed to stand behind the patient & bring his hand alcove the head to the patient's forehead & then perform the tap.
Thanks for the feedback.
So does the patient have Parkison's or not?
Hi. For clarity, this patient does not have PD. Rather, they are an actor demonstrating what you would expect to see.
this reflex should be elicited with your hand out of the patient's view. The reflex being shown in this video is the menace reflex.
Yes - apologies. I made this video almost 8-9 years ago and realise this was an oversight.
Glabellar reflex should be seen in AD
Thanks
for everyone, what is "AD". Initials these days are rampant and not everyone knows. Thanks.
the test should be performed with minimal visual stimulus-this test is wrongly performed in this video.
What can cause ...abnormality...? Why is it seen?
Parkinsons Disease and other diffuse brain diseases.
Emil Heilmanm Sørensen may I know the pathophysiology behind it?
I actually dont know. I am sorry. It may have something to do with the frontal lobes?
Emil Heilmanm Sørensen
Yes even I had read something like that.. Due to issues with frontal lobe... And also its said that its primitive reflex.. integrates if myelination occurs....
I'm just assuming that may be demylination may lead to reoccurrence of this sign
@@bhandarkar2138 destruction of the direct pathway in the basal ganglia leading to overemphasis via the indirect pathway.