If third pharyngeal pouches fail to form, which organ will fail to develop?

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Study for the NBME Histology Test. Access flashcards and multiple choice questions, each with hints and explanations. Prepare effectively for your exam!

Multiple Choice

If third pharyngeal pouches fail to form, which organ will fail to develop?

Explanation:
Third pharyngeal pouch derivatives include the thymus and the inferior parathyroid glands. If that pouch fails to form, those structures don’t develop, with the thymus being the organ affected among the options. The tonsils come from the second pouch, salivary glands arise from oral epithelium rather than a pharyngeal pouch, and the thyroid gland forms from the floor of the primitive pharynx, not from a pouch. So the thymus is the organ that would fail to develop.

Third pharyngeal pouch derivatives include the thymus and the inferior parathyroid glands. If that pouch fails to form, those structures don’t develop, with the thymus being the organ affected among the options. The tonsils come from the second pouch, salivary glands arise from oral epithelium rather than a pharyngeal pouch, and the thyroid gland forms from the floor of the primitive pharynx, not from a pouch. So the thymus is the organ that would fail to develop.

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