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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.


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The superior parathyroid gland and the ultimobranchial body develop from the fourth branchial pouch, also in the vicinity of the piriform sinus.
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.
 
 
 
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