Embryology of the Tongue Development

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Questions and Answers

What embryonic structures contribute to the formation of the anterior two-thirds of the tongue?

Two lateral lingual swellings and the epiglottis
Two lateral lingual swellings and the tuberculum impar (correct)
Copula and hypobranchial eminence
Tuberculum impar and the fourth pharyngeal arch

Which lymph nodes are responsible for draining the anterior two-thirds of the tongue?

Deep cervical lymph nodes
Submandibular lymph nodes
Submental lymph nodes (correct)
Parotid lymph nodes

What embryonic arch is primarily involved in the development of the epiglottis?

Second pharyngeal arch
Fourth pharyngeal arch (correct)
First pharyngeal arch
Third pharyngeal arch

How does the posterior one-third of the tongue form in relation to the anterior two-thirds?

<p>It fuses with anterior two-thirds along the sulcus terminalis (B)</p> Signup and view all the answers

What occurs to the contribution from the second pharyngeal arch during tongue development?

<p>It is overgrown by the hypobranchial eminence (C)</p> Signup and view all the answers

Flashcards

What forms the anterior two-thirds of the tongue?

The anterior two-thirds of the tongue develops from two lateral lingual swellings and the tuberculum impar, all originating from the first pharyngeal arch.

How does the posterior one-third of the tongue form?

The posterior one-third of the tongue develops from the hypobranchial eminence, initially formed by the second pharyngeal arch but later replaced by the fourth arch.

What is the sulcus terminalis?

The sulcus terminalis is a V-shaped groove on the dorsal surface of the tongue marking the junction between the anterior two-thirds and the posterior one-third, which develops during the fusion process.

What's the origin of the epiglottis?

The epiglottis, a leaf-shaped cartilage at the entrance of the larynx, originates from the fourth pharyngeal arch.

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How are the different parts of the tongue drained by the lymphatic system?

The lymphatic drainage of anterior two-thirds of the tongue is to the submental lymph nodes, sides of the tongue drain to the submandibular lymph nodes and the posterior one-third drains to the deep cervical lymph nodes.

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