| 释义 |
ˌultimoˈbranchial, a. Anat.
[f. L. ultim-us last + -o + branchial a.; so called because the gland develops from the most caudal pharyngeal pouches.]
Applied to a gland in the neck which in many lower vertebrates regulates the calcium level in the body but in man and several higher vertebrates is absorbed into the thyroid during embryonic life.
1913Gray's Anat. (ed. 18) 123 A pair of diverticula arise from the fifth branchial pouch and form what are termed the ultimobranchial bodies..: these fuse with the thyreoid gland, but probably contribute no true thyreoid tissue. 1968New Scientist 15 Feb. 375/2 The ultimobranchial glands are small and situated in the neck region in birds and reptiles, but are generally absent in mammals. 1976Path. Ann. XI. 222 Parafollicular C cells are not restricted to the thyroid, but can also be found in other structures embryologically connected with the ultimobranchial body, ie, parathyroid IV and thymus IV. |