Which among the following statement is not true?: (A) Superior thyroid aery is a branch of ext. carotid a, (B) Posterior branch of superior thyroid aery supplies parathyroid gland, (C) Inferior thyroid aery is branch of thyrocervical trunk, (D) Thyroid ima aery is invariably a branch of arch of aoa
Answer is D. The thyroid ima aery is infrequent (10%) and variable in its orgin. It arises from the brachiocephalic aery, aoic arch, right common carotid aery, internal thoracic aery, or subclan aery.