Common carotid artery divides at the level of

Ans. is 'c' i.e. Superior border of thyroid cartilage Common carotid artery ends at the level of upper border of the thyroid cartilage by dividing into external & internal carotid arteries Also remember the following imp. levels * Sternal angle- costal cartilage of 2nd rib, T4/T5IV disc* Xiphoid process- T9* Tracheal bifurcation- T4/T5 IV disc* Trachea extends from- C6 to T5* Arch of aorta begins and ends at- T4* Aortic opening in diaphragm- T12* Esophageal opening in diaphragm- T10* Vena caval opening in diaphragm- T8* Thoracic duct crosses from Rt to Left- T5* Splenic axis- 10th rib* Celiac trunk arises- T12/L, IV disc* Superior mesenteric artery arises- LI* Renal arteries- L1/L2* Inferior mesenteric artery- L3* Aorta ends by bifurcating into common iliac arteries- L4* IVC begins at- L5* Umbilicus- L3/L4