Retina | An Introduction | Part 1

Retina | An Introduction | Part 1
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▬▬▬▬▬▬▬▬▬▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
(0:00-3:40)
Delicate membranous light-sensitive part of the eye, location in the eye ball;
Outermost protective layer= Sclera & Cornea.
Middle layer (Uveal Tract) = Choroid, Ciliary body & Iris.
Innermost layer= Retina; pigmented epithelium, Innermost Neuronal layer of Retina.
(3:41-9:30)
Exact location of Retina; sandwiched between Vitreous Body inside (Vitreous aspect of retina) and Choroid outside (Choroidal part of retina).
Ora Serrata; Wavy margins where light sensitive part of retina terminates anteriorly.
(9:35-13:20)
Through the Ophthalmoscope: Only posterior part of retina i.e., Optic Disc and part around it visible; Ocular Fundus.
Non-light sensitive part of retina; continuing beyond Ora Serrata.
(13:22-23:20)
Embryological Development of Eye: CNS development; Neural Tube; Optic Vesicle to Optic Cup; Outer and Inner layers differentiate into outer pigmented & inner neuronal retinal layers.
Retina, therefore is the only part of CNS visible through ophthalmoscope.
(23:25-29:10)
Fundoscopy: Posterior pole of fundus(yellowish) [Macula Lutea]; Optic Disc nasally/medially (pale colored).
Macula Lutea in detail: Has undefined margins, slight depressed area in center; Fovea Centralis.
(29:15-34:25)
Optic Disc in detail: Highly vascular (Central Retinal Artery coming out of it), Optic Disc; point of Retina from where all optic nerve fibers are moving out of retina through lamina cribrosa as Optic Nerve.
Technically Optic Nerve is a CNS tract and not a nerve per say.
(34:30-38:40)
Optic Disc continued: Central Retinal Artery, branches after passing through the Optic Disc & its Nasal & Temporal branches then supply inner parts of Retina.
Outer part of Retina supplied by Choriocapillaris.
(38:41-41:30)
Optic Disc continued; Central Retinal Artery (CRA) continued: Fovea Centralis (FC); the area of maximal visual acuity, depends only on Choriocapillaris for nutrition & not CRA, therefore NO Blood Vessels: Avascular.
Further comparison of Macula Lutea and Optic Disc.
(41:31-43:44)
Clinical Co-relate of Optic Disc (OD): Physiological Cup: Depression in OD; In Glaucoma when ICP is very high, this cup is pushed backwards; pathologically cupped/depressed. No rods & cones here so; Blind Spot.
Comparison continued: In Fovea Centralis (FC), cones are packed very tightly & blood vessels basically pushed aside to reveal FC; hence thinnest area of the retina; sharpest acuity.
(43:48-45:30)
Summary of comparison b/w OD & Macula Lutea (ML); 1- OD nasally situated, ML central but inferolateral to OD.
2-OD = 1.5mm, while ML = 5-6mm.
3-OD is pale, ML yellowish.
4- OD = Blood vessels coming in & out; highly vascular, while ML = Avascular.
5- OD is a blind spot while ML has point of maximal visual acuity.
6-OD has 'Physiological cupping' while ML has Fovea Centralis.
7-OD has sharper margins, while ML much diffused, undefined margins.
(45:31-51:00)
Blood supply of Fovea Centralis. Descriptive schematic diagram of OD, ML, Optic Nerves and Retinal Arteries, along with their positions in eyeball from above.
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    Thank you for your love and support❤️⁩⁦❤️

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    TBN

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  • @jyotismitasarma9123
    @jyotismitasarma91236 жыл бұрын

    Sir, ur explanation is wonderful n spectacular.. My basics about retina r very much clear through ur explanation.. hope u give other lectures on other topics about eye too.. Teachers around d world should take inspiration from u... Thanks for ur effort...

  • @mexy230
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    great teaching,thanks a lot!

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    doc..do you have lectures of internal medicine for mbbs so I can buy it which will help my study,, thanks doc

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    7 жыл бұрын

    same im also in ukraine

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  • @aroojkanwal1712
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    Thank you so much

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    This Was the most Confusing Topic for me ....and Then , I Discovered dr. najeeb Sir, Now i Understood it Completely ....Thanks A Lot Sir 💓🙌 Love From India 🇮🇳

  • @DoctorNajeeb

    @DoctorNajeeb

    2 жыл бұрын

    You are most welcome. Stay motivated and stay blessed! ❤

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    A very talented teacher .. clear explanation ..thankyou so much sir ..🙏🙏🙏🙏🙏

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    doctor,ur lecturer is really awesome,i gained more information .thank you so much doctor.

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    @chih-hsienwu33665 жыл бұрын

    thank you professor !! your video really helps me a lot :)

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    @hajirhameed28936 жыл бұрын

    Great creator sobhan allah And amazing explanation

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    @drprashantsaini39223 жыл бұрын

    Sir apko dil se salam sir apne jese explani krte h bht bht bht jada khub aache se smj aata h ......sb clear h apka vedio dk kr

  • @adilt.v123
    @adilt.v123 Жыл бұрын

    Just amazing Sir ❤❤❤❤❤❤. What a brief and conceptual lecture you delivered. Allah bless you sir. جزاك اللّٰه خيرًا

  • @DoctorNajeeb

    @DoctorNajeeb

    Жыл бұрын

    Thank you for your kind words❤ Keep supporting ❤

  • @shahabuddin6149
    @shahabuddin61493 жыл бұрын

    Super explanation,father of medicine love you sir and a bundle of thanks

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    @jeevitharaghu97667 жыл бұрын

    thank you soo much sir ur lectures are very clear and understandable

  • @drmohamedahmed1709
    @drmohamedahmed17096 жыл бұрын

    sir dr najeeb thank you for understanding teaching

  • @yuvikayadav1203
    @yuvikayadav1203 Жыл бұрын

    Sir please take guest lectures in India also 🙏 Regards and respect

  • @tajudeenabidat5026
    @tajudeenabidat50266 жыл бұрын

    the lecture is super good, thank u DOC

  • @changeeyecolor3891

    @changeeyecolor3891

    3 жыл бұрын

    👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍

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    @amanrathore9234 жыл бұрын

    I am very lucky that I born in the era of MS Dhoni & Dr Najeeb

  • @sanskarsingh6514
    @sanskarsingh65143 жыл бұрын

    Easily understood 👌👌👍🏻 Good explanation 👏

  • @user-wz8fq4dw3x
    @user-wz8fq4dw3x3 жыл бұрын

    Thank you very much, this was very useful

  • @muhammadwaleed2436
    @muhammadwaleed24362 ай бұрын

    Thank you sir , May almighty Allah shower His blessings upon you.

  • @shakeelkhan9554
    @shakeelkhan95545 жыл бұрын

    Thank you sir.... you are the god gift in morphology.

  • @drdeepakpathak7697
    @drdeepakpathak76976 жыл бұрын

    Thank you so much sir dr deepak pathak MS shalakya Patanjali bharitya ayurvigyan Institute haridwar

  • @sanzidahasnat2838
    @sanzidahasnat28383 жыл бұрын

    It is my fortune to listen to a legendary palatable lecture by my respected teacher. May I request you to deliver a lecture on Physiology of Binocular Single Vision and Visual Pathway. I'll be eagerly waiting to listen to your lecture. Thank you Sir.

  • @harigopal522
    @harigopal5226 жыл бұрын

    Excellent explanation sir thank you

  • @geojor
    @geojor8 жыл бұрын

    great, thanks...

  • @pritamkumarmondal4254
    @pritamkumarmondal42548 жыл бұрын

    thank you sir......

  • @swasthiknayak.4766
    @swasthiknayak.47664 жыл бұрын

    A very good guide to all topics Thank you sir

  • @rajasekh4032
    @rajasekh40326 жыл бұрын

    Wow.. Great.. Thanks sir

  • @Sara-fh9cx
    @Sara-fh9cx8 жыл бұрын

    Thanx dr. This video so benefits to me 😄😄

  • @imydoc3963
    @imydoc39637 жыл бұрын

    THANK U DOCTOR

  • @mehrnazrazzazan2166
    @mehrnazrazzazan21666 жыл бұрын

    Thanks alot

  • @arunjohn6172
    @arunjohn61728 жыл бұрын

    u r awesome sir no words to describe ur greatness and work truly amazing

  • @user-qw6xj2wt5e
    @user-qw6xj2wt5e9 ай бұрын

    Clear my.all.concept.thank.you.sir.❤