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Anatomy of lacrimal apparatus Animation - USMLE Step 1
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- čas přidán 17. 08. 2024
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The lacrimal apparatus is a system in the human body responsible for the production, distribution, and drainage of tears. It plays a crucial role in maintaining the health and function of the eyes by keeping them moist, clean, and protected from foreign particles. The lacrimal apparatus consists of several key structures:
Lacrimal glands: These are paired almond-shaped glands located in the superior and lateral part of each orbit, just under the orbital rim. They produce the aqueous component of tears and are divided into two lobes: the larger orbital lobe and the smaller palpebral lobe.
Lacrimal ducts: These are small ducts that transport tears from the lacrimal glands to the conjunctival sac. The excretory ducts from the gland lobes merge to form around 6-12 small ducts that open into the superior conjunctival fornix.
Conjunctiva: This is a transparent mucous membrane that covers the inner surface of the eyelids (palpebral conjunctiva) and the anterior surface of the eyeball (bulbar conjunctiva). The conjunctiva helps distribute tears evenly across the eye surface during blinking.
Lacrimal puncta: These are small openings located at the medial end of both the upper and lower eyelids. They serve as entry points for tears into the lacrimal drainage system.
Lacrimal canaliculi: These are small channels that begin at the lacrimal puncta and transport tears from the eye surface to the lacrimal sac. Each canaliculus consists of a vertical and horizontal portion.
Lacrimal sac: This is a small, pouch-like structure located in the lacrimal fossa of the medial orbital wall. The upper end of the lacrimal sac is continuous with the canaliculi, while the lower end narrows to become the nasolacrimal duct.
Nasolacrimal duct: This duct extends from the lacrimal sac to the inferior nasal meatus inside the nasal cavity. It serves as the final drainage pathway for tears, emptying them into the nasal cavity.
The lacrimal apparatus helps maintain eye health by providing constant lubrication and protection. Tear production may increase due to emotional factors or the presence of irritants, resulting in tearing or watery eyes. Dysfunction of any part of the lacrimal apparatus can lead to problems like dry eye, excessive tearing, or infection.
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📌𝗝𝗼𝗶𝗻 𝗢𝘂𝗿 𝗧𝗲𝗹𝗲𝗴𝗿𝗮𝗺 𝗖𝗵𝗮𝗻𝗻𝗲𝗹 𝗛𝗲𝗿𝗲:- t.me/bhanuprakashdr
📌𝗦𝘂𝗯𝘀𝗰𝗿𝗶𝗯𝗲 𝗧𝗼 𝗠𝘆 𝗠𝗮𝗶𝗹𝗶𝗻𝗴 𝗟𝗶𝘀𝘁:- linktr.ee/DrGBhanuprakash
this should have way more likes. Thank you for making it animated.
That' s amazing really helpful sir ❤️
Glad to hear that
This video make easy for me to understand the lacrimal Apparatus. Thank you Sir
Ur most welcome
Ty.
We need animations for skull like that
suree
This video is very helpful
Thank u
Most welcome 😊
Best ever explanation ..
Thank u so much
How can I get rid of it , any medicine? Or home remedies? Please reply
is there any overlap between the muscles involved in the lacrimal apparatus and those that control eyeball movement? if so, could punctal dilation and a lacrimal system examination cause any potential cases of strabismus/eye misalignment?
Thank you sir !
Most welcome!
Thank you
Thank you sir
Welcome
Thank you so much
Most welcome
Well some tears come out down the anterior eye ball when we cry?? Not all drains into lacrima sac right?l
Nice
Thanks
Namaskar, Doc
Namasthy
❤❤❤❤
i accidentally pinched my eyelid while rubbing it and hurt my lacrimal gland area (top right of my left eye)- now i feel sharp pain when i cry or yawn? have i injured lacrimal duct? can these heal??????
It will heal on own
my lacrimal sac ONLY ever moves on my left eye when i sniff in… what is causing this????
Good
Tysm
😊😊😊😊
🎉🎉🎉🎉
I need your Android app link
😅😅😅😅
Thank you sir
welcome
❤❤❤❤