Development of Tongue - (Embryology video)
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- čas přidán 25. 07. 2017
- Development of Tongue - (Embryology video)
The tongue develops in relation to the pharyngeal arches in the floor of the developing mouth. We have seen that each pharyngeal arch arises as a mesodermal thickening in the lateral wall of the foregut and that it grows ventrally to become continuous with the corresponding arch of the opposite side . The medial-most parts of the mandibular arches proliferate to form two lingual swellings . The lingual swellings are partially separated from each other by another swelling that appears in the midline. This median swelling is called the tuberculum impar. Immediately behind the tuberculum impar, the epithelium proliferates to form a downgrowth (thyroglossal duct) from which the thyroid gland develops. The site of this downgrowth is subsequently marked by a depression called the foramen caecum.
Another, midline swelling is seen in relation to the medial ends of the second, third and fourth arches. This swelling is called the hypobranchial eminence . The eminence soon shows a subdivision into a cranial part related to the second and third arches (called the copula) and a caudal part related to the 4th arch . The caudal part forms the epiglottis. The anterior two- third of the tongue is formed by fusion of:
(a)the tuberculum impar, and
(b)the two lingual swellings.
The anterior two-third of the tongue is thus derived from the mandibular arch . According to some, the tuberculum impar does not make a significant contribution to the tongue.
The posterior one-third of the tongue is formed from the cranial part of the hypobranchial eminence (copula). In this situation, the second arch mesoderm gets buried below the surface. The third arch mesoderm grows over it to fuse with the mesoderm of the first arch . The posterior one-third of the tongue is thus formed by third arch mesoderm.
The posterior-most part of the tongue is derived from the fourth arch.
In keeping with its embryological origin, the anterior two-third of the tongue is supplied by the lingual branch of the mandibular nerve, which is the post-trematic nerve of the first arch and by the chorda tympani which is the pre-trematic nerve of this arch. The posterior one-third of the tongue is supplied by the glossopharyngeal nerve, which is the nerve of the third arch. The most posterior part of the tongue is supplied by the superior laryngeal nerve, which is the nerve of the fourth arch.
TONSILS
The musculature of the tongue is derived from the occipital myotomes . This explains its nerve supply by the hypoglossal nerve, which is the nerve of these myotomes.
The epithelium of the tongue is at first made up of a single layer of cells. Later it becomes stratified and papillae become evident. Taste buds are formed in relation to the terminal branches of the innervating nerve fibres.
Development of the tongue starts in the 4th month of intrauterine life.
Easy to understand and well summarized explanation. Thank you so much!
Love your work! This was so helpful,and easy to understand. Thank you dear doctor!
thank you very much for your support...
Beautifully explained 👍🧠
Such a simplified explanation doctor .... and those diagrams are very beautiful ...thank u
Where did this guy learn to draw! So awesome!
ha ha ..on my own..thank you very much
amazing illustration, easy explanation. Thank you so much!
Bhut acha. Smjhaya h sir😊..thnku sir for making it.
Wow, so informative , and very well conveyed with diagrams sir. Thank you
Your drawings are incredible and clear, well done :) Thank you!
thank you very much
Superb diagrams and nice explanation
That was simply superb clear cut explanation bro
Amazing! Thanks for the helpful video mate!
Wow very helpful... I like ur simplifiesd explanations... Tqsm
Thank you sir for such a simplified way of explanation...
you are most welcome
Seriously ur diagrams and explanation are both perfect ✨👍
God bless you.
Very good explanation
very well explained. Thank you so much Sir.
Well explained 👏👌👍
Thank you, it’s so helpful !
You are amazing....
This video was so good thank you
Great presentation and art work!!!
thank you very much..
This is very helpful. Thank you so much!
my pleasure
Nice explanation tank you
Very nice 👍
thanks
OMG amazing explanation! Thank you!
my pleasure
clearly explained, thankyou sir. Can you please explain occipital myotome and occipital somites sir?
Good work. Thanks. Nice diagrams
thank you..:)
THANKKK UUU SOOO MUCHHHHH
Thanks
Thanks 👍
Brother u are great
awesome work
thank you..
Nyc one bro...
thank you
Thank u sir that was really very easy to understand and make notes
my pleasure
Thank u ....
very nice explanation bro... 👍
thank you
Thnqqq
Good work
thank you..:)
👍👍
sooo nice
Wow.......Nice..
thank you
Wow❤️
love the video but could you please explain epithelial tissues of tongue again .. i didn't get it well .. thanks
In short..tongue has two parts..mucosal part and muscular part..they have different origin.. mucosal part of tongue is derived from lingual swellings,tuberculum impar,hypobranchial eminence(1st,2nd,3rd,4th arch)...but muscles are derived from occipital somites..
@@Medinaz great explanation🌹🌹
pin this .. medinaz...bcz video was lagged at that time ...
cool bro super ..
thank you..:)
Is tongue developed from 2nd arch???
Nice!
thank you
excellent
thank you
Nice👍
Thanks
Sir make one vidoe on thyroid gland please
nice
Thank you
Video is very helpful........ but y the fake accent ???
Y not just concentrate on the content ?
🤣
voice is clear accent should not matter
thank you
can you try to change your accent during speak. i dont understand very well
this is difficult for me..still I will try my best..
it is okay, sorry if you feel offended :)
no no..don't be sorry..feel free..any suggestion would be well accepted..:)
Awwwwssnmmm as fuckkk
Superb explanation. Please loose the accent
thank you for the suggestion
Nice way of discussion in british accent... Indian dont want this
O mithe hindi me bol le
your accent needs to be more clear :(
Wow❤️