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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“Man is the broken giant, and in all his weakness both his body and his mind are invigorated by habits of conversation with nature.”
—Ralph Waldo Emerson (1803–1882)