this is by far the best explanation, very logically built up. cheers! Just for reference: I am studying for psychology final exams. Yes, this is part of intropsych
@@MedicosisPerfectionalis thanks! I recommend putting other topics into the psychology playlist (if you have videos), such as transduction happening with audio, pathologies. This current video, for example, is perfect for the visual bit, and I would need something similar for the ear/audio. These topics belong to General Psychology and that is my topic for the final exam.
22:37 If the macula has a bilateral cortical representation why wouldn’t the contralateral cortex compensate for the heminopia in a unilateral optic tract, LGB or radiation lesion?
Because when there’s a lesion in the optic tract, LGB, or the entire optic radiation, the macula doesn’t have any path to communicate with the cortex at all. Each macula connects to both cerebral cortices through nerve fibers, but these nerve fibers have to travel through optic nerve, optic tract, LGB, and optic radiation. If you injure any of these areas, then the only way the macula has to reach both occipital cortices has been severed! Does that make sense?
@@MedicosisPerfectionalis my question is if the lesion occurred after the optic chiasma, won’t the nasal fibers have already crossed to the other side to reach the contralateral cortex carrying macular visual impulses as well?
@@ahmadalhadidi9411 The macular sparing occurs because the tip of occipital cortex(which represents the macula) has dual blood supply, the PCA and the MCA. NOW for some reason if the PCA is blocked in one hemisphere,there is loss of blood supply to the occipital cortex of that particular hemisphere except for the macular area of that hemisphere, coz the macula has another source of Blood supply MCA, so it's abilities are sustained
thank you so much for the content, YOU literally made everything understandable and as u said before we gonna pass the exam because of u xd thanks again and for the quiz ... could u check my answers.. question.(10) first part bilateral inferior quadrantanopia w\sparing macula second part > in the parietal optic radiation both sides question(11) first part bilateral superior quadrantanopia w\sparing macula second part > in the temporal optic radiation both sides
If the entire eye is part of the central nervous system and the retina can be restored then why do they say the optic nerve cannot be due to that the central nervous system cannot be?
The auditory pathway is discussed in my video: "Vestibulocochlear nerve - Cranial Nerve VIII. More pathways are talked about in other videos in my "Neuroanatomy" playlist!
Can anyone explain me what did he mean by ( the macula has bilateral cortical representation even if one cortex or one half or one hemisphere is “screwed” the macula is “spared” because the macula “get also supply” from the other cortex) I don’t speak English well but I understood everything at the beginning except this, also this bilateral cortical representation what is it exactly ? Thanks 🙏
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23:35, 10 and 11 are altitudinal visual field defects
Causes can be
G: glaucoma
O:optic disc drusen
A: ant ischemic optic neuropathy.
What they do to the visual pathway
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My professor just read slides for us
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this is by far the best explanation, very logically built up. cheers! Just for reference: I am studying for psychology final exams. Yes, this is part of intropsych
Glad it was helpful!
I am so glad!
Check out my psychology playlist!
@@MedicosisPerfectionalis thanks! I recommend putting other topics into the psychology playlist (if you have videos), such as transduction happening with audio, pathologies. This current video, for example, is perfect for the visual bit, and I would need something similar for the ear/audio. These topics belong to General Psychology and that is my topic for the final exam.
Broadmann area 17 is in the visual cortex.
18 and 19 are visual association areas.
Excellent!
I wish i knew u from the start.
My every junior will study from you, Sir!
16:51 small mistake here, upper lobe is parietal lobe not temporal lobe.
He said the upper is parietal and lower is temporal.... not sure how you heard him differently
Thank you for the video. please correct 16:51-53 it should be PARIETAL not temporal
Liked and subscribed, you are a lifesaver!
Wow this is amazing
You literally make everything easier
Thank you 🙏
Nerve is tract; Truth is lies.
No bro in cns fibers are called as tract , in pns they becomes nerves 😂
22:37 If the macula has a bilateral cortical representation why wouldn’t the contralateral cortex compensate for the heminopia in a unilateral optic tract, LGB or radiation lesion?
Because when there’s a lesion in the optic tract, LGB, or the entire optic radiation, the macula doesn’t have any path to communicate with the cortex at all. Each macula connects to both cerebral cortices through nerve fibers, but these nerve fibers have to travel through optic nerve, optic tract, LGB, and optic radiation. If you injure any of these areas, then the only way the macula has to reach both occipital cortices has been severed!
Does that make sense?
@@MedicosisPerfectionalis my question is if the lesion occurred after the optic chiasma, won’t the nasal fibers have already crossed to the other side to reach the contralateral cortex carrying macular visual impulses as well?
@@ahmadalhadidi9411 The macular sparing occurs because the tip of occipital cortex(which represents the macula) has dual blood supply, the PCA and the MCA.
NOW for some reason if the PCA is blocked in one hemisphere,there is loss of blood supply to the occipital cortex of that particular hemisphere except for the macular area of that hemisphere, coz the macula has another source of Blood supply MCA, so it's abilities are sustained
U make everything make sense, loovvvve
Thank you!
at 16:53, for upper lobe, you say temporal. I think you meant parietal, right? Thanks for the video!
thank you so much for the content, YOU literally made everything understandable and as u said before we gonna pass the exam because of u xd thanks again
and for the quiz ...
could u check my answers..
question.(10) first part
bilateral inferior quadrantanopia w\sparing macula
second part > in the parietal optic radiation both sides
question(11) first part
bilateral superior quadrantanopia w\sparing macula
second part > in the temporal optic radiation both sides
Is the 11th defect because the temporal optic radiation of both right and left cerebral hemisphere has a lesion?
But why macular sparing?🤔
If the entire eye is part of the central nervous system and the retina can be restored then why do they say the optic nerve cannot be due to that the central nervous system cannot be?
How about central bundle of optic radiations?
Love the 1984 reference!
Thanks!
I don't know that much but i have very random question can we directly connect eye to optic chiasm
10 ,11 altitude defect
Retinal artery occlusion
Ischemic optic neuropathy
Amazing 😊
Thank you so much!
Thank you for this.
My pleasure!
Please tell us what is the answer to the second question? I have a neurology exam next week 😢😢😢. Excellent explanation thank you very much.
10 and 11
Is it Inferior homonymous heminopia with macular sparing
And Superior homonymous heminopia with macular sparing
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@@MedicosisPerfectionalis
Sir can you do a video for each of the other pathways like auditory etc
The auditory pathway is discussed in my video: "Vestibulocochlear nerve - Cranial Nerve VIII.
More pathways are talked about in other videos in my "Neuroanatomy" playlist!
Magnificent ❤
Thank you!
Best sir
Thank you so much!
Thanks!
I am still studying this lecture
I wish you success!
thank you
@@MedicosisPerfectionalis اتوصى بنا شويه على رأى المصريين
Love u bro❤
Can anyone explain me what did he mean by ( the macula has bilateral cortical representation even if one cortex or one half or one hemisphere is “screwed” the macula is “spared” because the macula “get also supply” from the other cortex)
I don’t speak English well but I understood everything at the beginning except this, also this bilateral cortical representation what is it exactly ?
Thanks 🙏
It means that sensory afferent fibers from each macula will reach both cerebral cortices.
What happens in dyslexia
What is your specialty??🤩
Please who understood the joke at the beginning 😅
Broadman area 17
another goated video
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Thannnnnnnkk youuuuuuuu
My pleasure!
❤ thank you so much! Surgical sutures 🪡 please.. if you can do the lecture on the same. Will appreciate
GOAT
Thank you!
🎉 complete
Thank you!
Broadmann area 17
So that's why AMD are not successful , cause they can't see very well 22:54
LGBThalamus... noted
بنها فخورة
17 1:52
17??
it actually is area 17, gg
First comment ❤
Thank you!
10 and 11
Is it Inferior homonymous heminopia with macular sparing
And Superior homonymous heminopia with macular sparing
Broadmann area 28
10 and 11
Is it Inferior homonymous heminopia with macular sparing
And Superior homonymous heminopia with macular sparing