ultimobranchial body
noun
: a hollow vesicle that is formed from the fourth pharyngeal pouch, may represent a fifth pharyngeal pouch, and gives rise to cells that produce calcitonin and later become incorporated into the thyroid gland in higher vertebrates or persist as distinct organs in birds and lower vertebrates
called also postbranchial body
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“Ultimobranchial body.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/ultimobranchial%20body. Accessed 23 Nov. 2024.
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