q17 - raji_321

[ArchivalUser]

Evaluation of an infant with a variety of congenital abnormalities reveals hypocalcemia due to a lack of parathyroid hormone. On x-ray, the thymic shadow is absent. A failure of development and differentiation of which of the following embryonic structures would most likely be responsible for the observed presentation?
A. Second pharyngeal arch
B. Second pharyngeal cleft
C. Second pharyngeal pouch
D. Third pharyngeal arch
E. Third pharyngeal pouch

[ArchivalUser]

E.

[ArchivalUser]

ee

[ArchivalUser]

eee....

[ArchivalUser]

E is correct

[ArchivalUser]

EE