Podcast
Questions and Answers
From which structure does the thyroid gland develop?
From which structure does the thyroid gland develop?
What structure displaces the thyroglossal duct forward during development?
What structure displaces the thyroglossal duct forward during development?
What marks the site of the thyroid gland's origin in the adult?
What marks the site of the thyroid gland's origin in the adult?
What is formed by the bifurcation of the thyroglossal duct?
What is formed by the bifurcation of the thyroglossal duct?
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On which side of the midline does the thyroglossal duct typically lie?
On which side of the midline does the thyroglossal duct typically lie?
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Study Notes
Development of Thyroid Gland
- Thyroid gland develops from a median downgrowth of cells from the pharyngeal floor between the first and second pharyngeal pouches
- This area is later marked by the foramen caecum of the tongue
Development of Thyroglossal Duct
- The canalized column of cells forms the thyroglossal duct
- The duct is displaced forward by the developing hyoid bone
- The duct lies slightly to one side, more commonly to the left, below the hyoid bone
Formation of Thyroid Lobes and Pyramidal Lobe
- The thyroglossal duct bifurcates to form the thyroid lobes
- A portion of the duct forms the pyramidal lobe
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Description
Learn about the formation of the thyroid gland from the median down growth of pharyngeal floor cells and its development into thyroglossal duct and thyroid lobes. Understand the role of the hyoid bone in its displacement and the formation of the pyramidal lobe.
