<prompt> Greater cornua of hyoid unites with body at -C1C3C6T1  <response>: Ans. is b i.e., C3 o Hyoid bone lies at the level of third cervical vertebrae.StructureCervico thoracic levelTracheal bifurcationT4-T5Arch of aortaBegins and ends at T4Xiphoid processT9Splenic axisAlong 10th ribCarotid bifurcation, Hyoid boneC3Upper border of thyroid cartilageC4Level of cricoids cartilageC6 Lumbar levelCeliac trunkT12 - LISuperior mesenteric arteryLITranspyloric planeLower border of LITermination of spinal cordLower border of LI in adults and upper border of L3 in newbornPancreasL1-L2Left renal veinL2Inferior mesenteric arteryL3UmbilicusL3Aortic bifurcationL4Transtubercular planeL5Common iliac ends atL5 - SI 