Development Of Tongue
ฝัง
- เผยแพร่เมื่อ 5 ต.ค. 2024
- The tongue is an extremely sensitive organ that performs on a complex muscle background. The primary functions of the stomatognathic system, such as mastication, deglutition, and speech, require the active involvement of the tongue. Embryologically, the development of tongue is a very complicated process that starts around the fourth or fifth week of the gestation period, and its development has a marked influence on the oral cavity.The tongue begins to develop around the fourth week of intrauterine life. The first, second, third, and fourth pharyngeal arches contribute to the development of the various portions of the tongue.
DEVELOPMENT
The development begins with the growth of a medial swelling from the first pharyngeal arch, known as tuberculum impar. Gradually, two lateral lingual swellings start to grow in the 5th week from the same arch. As the lateral swellings increase in size, they eventually merge and overlap tuberculum impar. This merging leads to the formation of the anterior two-thirds of the tongue. Since the mucosa overlying this area of the tongue has its origin from the first pharyngeal arch; it receives its sensory innervation from the mandibular branch of the V cranial nerve (trigeminal nerve).
Meanwhile, from the mesoderm of the second, third, and fourth pharyngeal arches, another median swelling, known as hypobranchial eminence, begins to develop and form the posterior third of the tongue. The mucosa overlying this area of the tongue receives its sensory innervation from the IX cranial nerve (glossopharyngeal nerve). The posterior-most part of the tongue develops from a third median swelling, arising from the fourth pharyngeal arch. This area of the tongue receives its innervations from the superior laryngeal nerve.
The muscles of the tongue predominantly derive from the myoblasts which originate in the occipital somites. They receive their innervations from the XII cranial nerve (hypoglossal nerve) except the palatoglossus muscle. The muscles of the tongue include extrinsic and intrinsic muscles. The extrinsic muscles are four in number (genioglossus, palatoglossus, styloglossus, and hyoglossus) and originate from the structures adjacent to the tongue. They allow the tongue to move in all directions. On the other hand, the four paired intrinsic muscles which include superior longitudinal, inferior longitudinal, verticalis, and transverses muscle have their origin as well as insertion inside the tongue. They are responsible for changing the shape of the tongue.
The first sign of development of taste bud on the lingual epithelium occurs at the 8th week of gestation. Between the ninth and eleventh week of gestation, many taste bud primordia develop. They differentiate into different cell types around the eleventh through the thirteenth postovulatory week. During this period, taste pores also develop
It was explained in the most easiest way..... Except for one thing that cupola form posterior 1 3..... And hypobranchial eminence form the posterior most....... Both are not the same thing
Hi! I have an embryology exam today and I just found your video and channel! Thanks so much! Subscribed!!
You're welcome 😊,thank you
I love this! You did such a great job with this video. It is very descriptive and I am able to understand it more! Thank you so much.
Thank you , keep watching ❤️
Nice explanation, but corda tympani nerve is the pre-trematic nerve of the 1st arch...not the 2nd arch
The part of toungue formed from second arch is not from the tuberculum impar... Its from the cranial part of HE.... Thankyou for the class♥
Thanks ma'am for making this so easy 😇
You're welcome 😊
One of the best lectures
Mam Thanks For Being There ❤️ for Tomorrow Anat Exam
You're welcome, happy that it helped. Keep watching
It's very very very helpful mam thank you, been searching for this type of video for 2 hours
The muscles of tongue are supplie by the hypoglossal nerve Apart from the palataglosus
Very helpful
Thank you so much💙
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Thankuuuu so muchhh😊
It's to much clearly explained ....thank u mam ....it's very much helpful for me before exam 😊
Glad you like it, keep watching, thank you. ❤️
Thank you so much ma'am ❤
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well explain 👌thank u
You're welcome 😊
If the anterior 2/3 of tongue is from 1st PA ...why does it recieve innervation from the facial nerve (which is from 2nd PA.. which forms the part of the post 1/3 tongue) ??
What is pretrematic and post trematric?
Very nice explanation👍
Thank you ☺️
Plse do some head and neck relateed videos...
Okay sure ☺️
Tuberculum impar from first arch or second arch?
Thank you mam
Beautifully explained
Clear mam ,thank you mam!!!😊
Thank you so much
Thank you son much ma'am
You're welcome 😊
Absolutely wonderful!
Thank you ma'am ❤
Thankyou
You're welcome keep watching ❤️
nice outlay continue...
Note: chorda tympanic give pre trematic supply to first arch..not second arch
Awesome explanation mam...tq mam 🙏 🙏🙏🙏..mam plz make video on rotation of gut
Thank you ,and you're welcome..
Sure😊
Thanks mam 😀
You're welcome 😊
how is the anterior 2/3 made from the first arch but innervated by the chorda tympani from the second arch?
Easy to understand 😌 ... good job🤟
Thank u so much 💓 💗 💖 💕 💛
Mam excellent 👌👌
Thank you 😊
Underrated channel😃😃
Thank you ❤️ means alot.. keep supporting
Thank you madam 😇😇😇
very well done everything ❤️
Great 👌🏻
Pretrematic from 2nd arch ????????
How long is the tongue measured ??
WOW, perfect
Supper
Madam plz provide notes madam
🤗🤗🤗🤗
Thank you very much ma'am 💗