Pharyngeal Arches
Embryology
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Musculoskeletal & Nervous Systems
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The Pharyngeal Arches
Q. A newborn is found to have ectopic thyroid tissue at the tongue base, near the foramen cecum. Failure of which process most likely caused this condition?
a
Regression of Rathke’s pouch
b
Separation of the optic vesicle from the diencephalon
c
Migration of the thyroid primordium along the thyroglossal duct
d
Formation of the cricoid cartilage
e
Migration of neural crest cells into pharyngeal arch 2
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