[A rare variation of the origin of the posterior cerebral artery (a. occipitalis lateralis from the internal carotid artery].

A rare condition of the origin of the lateral occipital artery is described. The artery arises from the internal carotid artery and gives off cortical branches and central branches. From the A. occipitalis medialis origin from the arterial circle, central and cortical branches arises too. The caliber of the branches and the side of origin are discussed with other results from normal brains and our knowledges of the genesis of the cerebral arteries.