Ultimobranchial gland, hauv biology, ib qho ntawm lub cev me me hauv lub pharynx uas txhim kho tom qab ob khub ntawm gill hnab hauv vertebrate embryo . Hauv cov tsiaj nyeg cov ntaub so ntswg ultimobranchial tau dhau los ua rau hauv cov hlwb parafollicular parafollicular cells Parafollicular cells, tseem hu ua C cells, yog neuroendocrine hlwb hauv cov thyroid. Lub luag haujlwm tseem ceeb ntawm cov hlwb no yog tso tawm calcitonin. Lawv nyob ib sab ntawm cov thyroid follicles thiab nyob hauv cov ntaub so ntswg sib txuas. https://en.wikipedia.org › wiki › Parafollicular_cell
Parafollicular cell - Wikipedia
ntawm cov thyroid caj pas.
Ultimobranchial cev yog dab tsi?
Lub cev lub cev ultimobranchial (UBB) yog qhov tawm ntawm lub hnab pharyngeal thib plaub uas fuses nrog cov thyroid diverticulum, ua rau cov calcitonin tsim C-cells. Hauv txoj kev tshawb no, peb pom tias UBB muaj ob hom hlwb: ib qho qhia T/ebp/Nkx2.
cov hlwb parafollicular nyob qhov twg?
Parafollicular (PF) cell muaj nyob hauv cov thyroid caj pasthiab yog ib feem ntawm cov kab mob neuroendocrine. Raws li cov khoom siv histochemical, lawv tau muab cais ua APUD hlwb [1].
thyroid caj pas tsim los ntawm qhov twg?
Cov thyroid yog los ntawm ob lub ntsiab lus: lub plab pharynx thiab neural crest. Lub rudimentary lateral thyroidtsim los ntawm cov hlwb neural crest, thaum cov thyroid nruab nrab, uas tsim cov qog, tshwm sim los ntawm cov pharynx.
calcitonin ua haujlwm yog dab tsi?
Calcitonin koom nrog pab tswj qib calcium thiab phosphate hauv cov ntshav, tawm tsam qhov kev ua ntawm parathyroid hormone. Qhov no txhais tau tias nws ua kom txo cov calcium hauv cov ntshav.
