MCQ IN MEDICINE

Detailed explanation-1: -The distal part of the internal carotid arteries form from the dorsal aortae. The fate of the fourth pair is different on the two sides. On the right side the proximal portion of the right subclavian artery forms, whereas on the left side, the fourth arch contributes part of the arch of the aorta.

Detailed explanation-2: -Overview. Your carotid arteries are located in your neck. Your left common carotid artery arises from your aortic arch, while your right common carotid artery arises from your brachiocephalic artery (trunk).

Detailed explanation-3: -There are two internal carotid arteries in total, one on each side of the neck. They originate from the carotid bifurcation, travel through the carotid sheath in a superior direction along the neck, and enter the skull through the external opening of carotid canal.

Detailed explanation-4: -The final section of the aortic arch is just distal to the origin of the left subclavian artery and is known as the aortic isthmus.