Which pharyngeal pouch forms the palatine tonsil?

Which pharyngeal pouch forms the palatine tonsil?

• A. Second pharyngeal pouch
• B. First pharyngeal pouch
• C. Third pharyngeal pouch
• D. Fourth pharyngeal pouch

Answer: (A)

The palatine tonsil originates from the endodermal lining of the second pharyngeal pouch. Each pouch contributes to different structures, and the second pouch specifically gives rise to the tonsillar tissue that forms the tonsil located in the tonsillar fossa between the palatoglossal and palatopharyngeal arches. In contrast, the first pouch forms the tympanic cavity and auditory tube, the third pouch gives thymus and inferior parathyroids, and the fourth pouch gives superior parathyroids and the ultimobranchial body. So, the palatine tonsil is derived from the second pharyngeal pouch.

The palatine tonsil originates from the endodermal lining of the second pharyngeal pouch. Each pouch contributes to different structures, and the second pouch specifically gives rise to the tonsillar tissue that forms the tonsil located in the tonsillar fossa between the palatoglossal and palatopharyngeal arches. In contrast, the first pouch forms the tympanic cavity and auditory tube, the third pouch gives thymus and inferior parathyroids, and the fourth pouch gives superior parathyroids and the ultimobranchial body. So, the palatine tonsil is derived from the second pharyngeal pouch.