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Questions and Answers
From which structure does the thyroid gland develop?
From which structure does the thyroid gland develop?
- A ventral growth of cells from the pharyngeal pouches
- A median down growth of cells from the pharyngeal floor (correct)
- A lateral growth of cells from the pharyngeal floor
- A dorsal growth of cells from the pharyngeal pouches
What structure displaces the thyroglossal duct forward during development?
What structure displaces the thyroglossal duct forward during development?
- Hyoid bone (correct)
- Cruciform cartilage
- Thyroid cartilage
- Cricoid cartilage
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?
- Thyroid notch
- Foramen ovale
- Foramen caecum (correct)
- Cricothyroid membrane
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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