THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The common carotid artery bifurcates into the internal and external carotid arteries at the carotid sinus. Both give off branches that supply different areas of the scalp. The external carotid branches off to form the superficial temporal, posterior auricular, occipital, and the angular artery.

Detailed explanation-2: -The carotid arteries are the main blood vessels that supply blood to the neck, face and brain.

Detailed explanation-3: -The external carotid artery is a major artery of the head and neck supplying blood to the face and neck, while the occipital artery supplies blood to the back of the scalp, the sternomastoid muscles, and the deep muscles of the neck and back.

Detailed explanation-4: -The occipital area receives its blood supply from the occipital artery, and the blood drains via the occipital vein. The occipital artery has its origin from the external carotid artery, where it is deep to the digastric posterior belly and the hypoglossal nerve winds around it.