ultimobranchial body

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ultimobranchial body

One of two embryonic pharyngeal pouches usually considered as rudimentary fifth pouches. They become separated from the pharynx and incorporated into the thyroid gland, where they give rise to parafollicular cells that secrete calcitonin, a hormone that lowers the blood calcium level.
See also: body
References in periodicals archive ?
C cells are neural crest-derived cells arising from ultimobranchial bodies. The usual distribution of C cells is in the middle to upper lateral lobes of the thyroid gland because the ultimobranchial bodies fuse with that portion of the gland during embryogenesis.
(10) The thyroid gland then descends to meet the lateral ultimobranchial bodies; the fusion of these elements leads to the formation of the functional and mature thyroid gland by the third fetal month.