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Questions and Answers
What forms the initial structure for tongue development during the fourth week of prenatal development?
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?
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?
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?
What is the final structure of the tongue at the eighth week of development?
Which structure grows in size and merges with the tuberculum impar during tongue development?
Which structure grows in size and merges with the tuberculum impar during tongue development?
Which statement about the location of the tuberculum impar is correct?
Which statement about the location of the tuberculum impar is correct?
What developmental event characterizes the transition from the third week to the eighth week of tongue development?
What developmental event characterizes the transition from the third week to the eighth week of tongue development?
Which structure contributes to the formation of the base of the tongue?
Which structure contributes to the formation of the base of the tongue?
What is the term used for the starting point of the thyroglossal duct in tongue development?
What is the term used for the starting point of the thyroglossal duct in tongue development?
During which week of prenatal development does the fusion of tongue components primarily occur?
During which week of prenatal development does the fusion of tongue components primarily occur?
The anterior swellings that merge with the copula originate from which branchial arch?
The anterior swellings that merge with the copula originate from which branchial arch?
What anatomical structure serves as a superficial demarcation during the fusion of the tongue?
What anatomical structure serves as a superficial demarcation during the fusion of the tongue?
Which branchial arch primarily contributes to the development of the copula in the tongue?
Which branchial arch primarily contributes to the development of the copula in the tongue?
What is the significance of the pathway provided by the thyroglossal duct?
What is the significance of the pathway provided by the thyroglossal duct?
Which part of the tongue is primarily covered by the fusion of the swellings?
Which part of the tongue is primarily covered by the fusion of the swellings?
What structure demarcates the boundary between the anterior and posterior parts of the tongue?
What structure demarcates the boundary between the anterior and posterior parts of the tongue?
What structure is formed by the fusion of the two lateral lingual swellings during tongue development?
What structure is formed by the fusion of the two lateral lingual swellings during tongue development?
Which structure marks the site of fusion between the lateral lingual swellings?
Which structure marks the site of fusion between the lateral lingual swellings?
What is the primary role of the copula in tongue development?
What is the primary role of the copula in tongue development?
Which of the following statements is true regarding the development of the tongue?
Which of the following statements is true regarding the development of the tongue?
What additional structure appears posterior to the copula during tongue development?
What additional structure appears posterior to the copula during tongue development?
During which stage of development do the fused swellings result in the body of the tongue?
During which stage of development do the fused swellings result in the body of the tongue?
What happens to the tuberculum impar during tongue development?
What happens to the tuberculum impar during tongue development?
What is the anatomical significance of the median lingual sulcus?
What is the anatomical significance of the median lingual sulcus?
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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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