ultimobranchial


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ultimobranchial

pertaining to the tissue originating from the fifth pharyngeal pouch of the embryo.

ultimobranchial body
the glandular tissue originating from the fifth branchial pouch which combines with the buccal cavity outgrowth to form the thyroid and contributes calcitonin-secreting cells to the gland.
ultimobranchial duct cysts
derived from remnants of the ultimobranchial body and found in the thyroid gland.
ultimobranchial tumor
a neoplasm containing thyroid C cells.
References in periodicals archive ?
Common stem cell theory--suggests that both tumours arise from common uncommitted stem cells derived from ultimobranchial body.
C cells arise from the ultimobranchial body, which is derived from the fourth pharyngeal pouch, and they are found in the upper and middle areas of the thyroid lobes.
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.
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.
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.
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.