The ultimopharyngeal body or ultimobranchial body or ultimobranchial gland is a small organ found in the neck region of many animals.
In humans, the ultimobranchial body is an embryological structure that gives rise to the calcitonin-producing cells—also called parafollicular cells or C cells—of the thyroid gland. In humans, this body is a derivative of the ventral recess of the fourth pharyngeal pouch (or fifth)
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“Now wait a minute, wait a minute. What kind of a deal is this? You can’t go shoving just anybody’s body off on me.”
—Seton I. Miller (1902–1974)