ultimobranchial(redirected from ultimobranchial tumor)
pertaining to the tissue originating from the fifth pharyngeal pouch of the embryo.
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.
a neoplasm containing thyroid C cells.