Common carotid artery divides at the level of –
**Core Concept**
The common carotid artery is a major blood vessel in the neck that supplies blood to the head and neck. It arises from the brachiocephalic trunk on the right and directly from the aortic arch on the left. The **bifurcation of the common carotid artery** is an important anatomical landmark.
**Why the Correct Answer is Right**
The common carotid artery divides into the internal and external carotid arteries at the level of the upper border of the **thyroid cartilage**, which is typically around the C3-C4 vertebral level. This bifurcation is a crucial anatomical location for various medical procedures.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the common carotid artery does not bifurcate at this level.
**Option B:** This option is also incorrect as it does not accurately represent the level of bifurcation.
**Option D:** Similarly, this option is incorrect as the bifurcation occurs higher than this level.
**Clinical Pearl / High-Yield Fact**
The level of the common carotid artery bifurcation is a key landmark in neck surgeries and **carotid endarterectomy** procedures. Remembering this level can help in identifying the internal and external carotid arteries.
**Correct Answer:** C. Upper border of thyroid cartilage