NBME Answers : mistermbg's page

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PMID 8165531

Both superior thyroid (ext carotid) and inferior thyroid (thyrocervical) supply the parathryoids. Bad q...

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tekkenman101 Main supply to parathyroids is inferior, so no. +1

mistermbg "The thyroid gland and the parathyroid glands share the same blood supply. The inferior thyroid arteries supply the parathyroid glands via its branches (supplying both the inferior and superior parathyroids in most cases). Collaterals via the superior thyroid artery, thyroid ima artery, laryngeal, tracheal, and esophageal arteries. Parathyroid veins drain into the thyroid vein plexus." https://www.ncbi.nlm.nih.gov/books/NBK537203/#:~:text=Blood%20Supply%20and%20Lymphatics,-The%20thyroid%20gland&text=The%20inferior%20thyroid%20arteries%20supply,%2C%20tracheal%2C%20and%20esophageal%20arteries. the MAIN SUPPLY IS FROM THE INFERIOR THYROID ARTERIES. the little bit of blood received from the collateral keeps them alive but now they sense low ca2+ --->>> so release tons of PTH... if the superior was knocked out = not a big deal --> not main supply to the glands. +2

burak everyone keeps saying it is sensing low ca level so secreting more pth. But Ca is already low so it is not sensing anything wrongly. Or I am just blind i dont know. +1