At the conclusion of each day, a 32-year-old lady complains of hand weakness and "heaviness" in her eyelids. An anterior mediastinal mass is seen on chest imaging. The organ from which this mass most likely arose has the same embryologic origin as:

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Eductional Objective: Myasthenia gravis is related with thymic abnormalities (e.g. thymoma, thymic hyperplasia). The third pharyngeal pouch is where the thymus and inferior parathyroid glands emerge.

At the Conclusion of Each Day, a 32-Year-Old Lady Complains