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 ?
Gotoh, "FRS2a is required for the separation, migration, and survival of pharyngeal-endoderm derived organs including thyroid, ultimobranchial body, parathyroid, and thymus," in Yearbook of Pediatric Endocrinology, J.-C.
Ultimobranchial body and parathyroid glands of the freshwater snake Natrix piscator in response to vitamin D3 administration.
Structure and behaviour of the corpuscles of Stannius, the ultimobranchial gland and the prolactin cells in response to prolactin induced hypercalcemia in male catfish Clatias batrachus (L.).
Common stem cell theory--suggests that both tumours arise from common uncommitted stem cells derived from ultimobranchial body.
The first theory is the embryonic nest theory, which suggests that squamous cells are derived from embryonic remnants such as thyroglossal duct, thymic epithelium and ultimobranchial body.
C cells originate in the neural crest and reach their usual anatomic location as parafollicular cells in the thyroid via the ultimobranchial bodies that migrate to fuse with the lateral lobes of thyroid.
The superior parathyroid gland and the ultimobranchial body develop from the fourth branchial pouch, also in the vicinity of the piriform sinus.
(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.
We showed that CTAVN and solid cell nests of the thyroid gland are identical structures and indicated that CTAVN is an ultimobranchial heterotopia secondary to an alteration in cardiac neural crest cell development.
Cells from the neural crest descend to the ultimobranchial body and finally migrate to amalgamate with the thyroid tissue and form the parafollicular cells (C cells).
(1) As noted in the table, fourth branchial pouch anomalies virtually always occur on the left side, which is thought to be due to diminished growth of the right ultimobranchial body.