Tongue Development Anatomy

Questions and Answers

What forms the initial structure for tongue development during the fourth week of prenatal development?

Median swelling of the primitive pharynx

Tuberculum impar (correct)

Lateral lingual swellings

Copula overgrowing second branchial arches

Which branchial arch is NOT involved in the initial formation of the tongue?

Third branchial arch (correct)

First branchial arch

Second branchial arch

Fourth branchial arch

During which weeks does the body and base of the tongue begin to merge?

Fourth to sixth week

Eighth to tenth week

Fourth to eighth week (correct)

Sixth to eighth week

What is the final structure of the tongue at the eighth week of development?

Complete merging of anterior swellings and copula Signup and view all the answers

Which structure grows in size and merges with the tuberculum impar during tongue development?

Lateral lingual swellings Signup and view all the answers

Which statement about the location of the tuberculum impar is correct?

It is positioned in the midline of the primitive pharynx Signup and view all the answers

What developmental event characterizes the transition from the third week to the eighth week of tongue development?

Merging of anterior swellings and the copula Signup and view all the answers

Which structure contributes to the formation of the base of the tongue?

Copula Signup and view all the answers

What is the term used for the starting point of the thyroglossal duct in tongue development?

Foramen cecum Signup and view all the answers

During which week of prenatal development does the fusion of tongue components primarily occur?

Eighth week Signup and view all the answers

The anterior swellings that merge with the copula originate from which branchial arch?

First branchial arch Signup and view all the answers

What anatomical structure serves as a superficial demarcation during the fusion of the tongue?

Sulcus terminalis Signup and view all the answers

Which branchial arch primarily contributes to the development of the copula in the tongue?

Second branchial arch Signup and view all the answers

What is the significance of the pathway provided by the thyroglossal duct?

It allows for thyroid gland migration into the neck. Signup and view all the answers

Which part of the tongue is primarily covered by the fusion of the swellings?

Dorsal surface of the tongue Signup and view all the answers

What structure demarcates the boundary between the anterior and posterior parts of the tongue?

Sulcus terminalis Signup and view all the answers

What structure is formed by the fusion of the two lateral lingual swellings during tongue development?

Anterior two thirds of the tongue Signup and view all the answers

Which structure marks the site of fusion between the lateral lingual swellings?

Median lingual sulcus Signup and view all the answers

What is the primary role of the copula in tongue development?

To form the base of the tongue Signup and view all the answers

Which of the following statements is true regarding the development of the tongue?

The hyoid arch contributes to the formation of the base of the tongue. Signup and view all the answers

What additional structure appears posterior to the copula during tongue development?

Epiglottic swelling Signup and view all the answers

During which stage of development do the fused swellings result in the body of the tongue?

Fetal development timeline Signup and view all the answers

What happens to the tuberculum impar during tongue development?

It disappears as the swellings overgrow. Signup and view all the answers

What is the anatomical significance of the median lingual sulcus?

It indicates the fusion line of anterior swellings. Signup and view all the answers

Study Notes

Body of Tongue Development

Initially, the body of the tongue begins as a triangular median swelling known as the tuberculum impar, located in the midline of the primitive pharynx.
Two lateral lingual swellings emerge and grow over the tuberculum impar, forming the anterior two-thirds of the tongue.
The median lingual sulcus marks the fusion line of the two lateral lingual swellings.

Base of Tongue Formation

The copula, a pair of swellings, appears immediately posterior to the anterior swellings.
The copula gradually merges with the second branchial arch (the hyoid arch) to create the posterior one-third of the tongue.
An additional swelling called the epiglottic swelling, further posterior to the copula, will develop into the epiglottis.

Completion of Tongue Formation

By the eighth week of prenatal development, the copula finishes merging with the anterior swellings, forming a complete tongue.
This fusion is indicated by the sulcus terminalis, which delineates the body from the base of the tongue.
The foramen cecum, located at the terminal sulcus, is the beginning of the thyroglossal duct and serves as a migration pathway for the thyroid gland to the neck region.

Development Timeline

Tongue development occurs between the fourth to eighth week of gestation, involving key structures:
- Fourth week: Initial formation of the tuberculum impar and lateral lingual swellings
- Eighth week: Complete formation through the merging of structures from both the body and base of the tongue
The development is influenced by the first four branchial arches.

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Description

This quiz covers the development of the tongue, specifically focusing on the formation of the anterior two-thirds, or body, of the tongue. You'll explore the anatomical features involved in this developmental process. Perfect for students of anatomy and biology.