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The superior thyroid artery is typically the first branch of the external carotid artery. Most of its flow directed into the thyroid bed, with a characteristic thyroid blush on catheter angiography.It is very often seen on a (well-performed) CTA.A superior laryngeal branch often arises from the superior thyroid artery.Penetrating the thyrohyopid membrane along with the superior laryngeal nerve of the vagus nerve, it supplies stuctures of the larynx and hypopharynx.ost of its flow directed into the thyroid bed, with a characteristic thyroid blush on catheter angiography. It is very often seen on a (well-performed) CTA. A superior laryngeal branch often arises from the superior thyroid artery.
(From Wikipedia). The internal carotid artery passes superiorly from the carotid canal in the base of the skull, emerging via that part of the foramen lacerum which is not occluded by cartilage. The artery of pterygoid canal, the nerve of pterygoid canal and some venous drainage also pass through the foramen lacerum. The ascending pharyngeal artery is one of three possible meningeal branches of this vessel. 2  Lastly, some emissary veins pass through the foramen lacerum. 3  These connect the extracranial pterygoid plexus with the intracranial cavernous sinus and present an unopposed route for infection.