|Precursor||fourth pharyngeal pouch|
|Gives rise to||parafollicular cells|
The ultimobranchial body or 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 clear cells—of the thyroid gland. In humans, this body is a derivative of the ventral recess of the fourth pharyngeal pouch (or fifth)