The internal carotid artery emanates from the common carotid artery and goes vertically up to the base of the skull. It has no branches in the neck and then passes through the carotid canal into the cranial cavity, and its branches are mainly small vascular branches distributed in the brain and eyes. More important is the external carotid artery, which also starts from the common carotid artery and has eight branches, namely the superior thyroid artery, lingual artery, facial artery, superficial temporal artery, maxillary artery, occipital artery, posterior auricular artery, and ascending pharyngeal artery, which are distributed in the head, face, neck, occiput, posterior ear, and pharynx, and its blood supply is abundant. In addition patients with cirrhosis often have varicose veins in this area.