The PICA is one of the main arteries that supply the cerebellum. The findings on the relationship of the PICA to the lower cranial nerves could be helpful in microsurgery of this region. The posterior inferior cerebellar artery (PICA, Latin: arteria cerebelli inferior posterior) is the largest branch of the vertebral artery. The lateral medullary segment of the PICA in 20% specimens passed superior to the hypoglossal nerve, in 47.5% through the rootlets of the hypoglossal nerve, and in 30% inferior to the hypoglossal nerve. The lateral medullary segment of the PICA showed a lateral loop which in 20% specimens pressed against the inferior surfaces of the facial and vestibulocochlear nerves. The anterior communicating artery (AComm) is a short, slender vessel that runs horizontally between the anterior cerebral arteries. The posterior inferior cerebellar artery (PICA) usually arises. In this study, 12.5% of PICAs passed between the glossopharyngeal and vagus nerves, 20% between the vagus and accessory nerves, and 65% through the rootlets of the accessory nerve. Overview The circle of Willis encircles the stalk of the pituitary gland and provides important communications between the blood supply of the forebrain and hindbrain (ie, between the internal. Key words: posterior inferior cerebellar artery, anatomy, variations, diameter. The aim of this article is to describe the anatomical relationship of the PICA to the lower cranial nerves. The PICA had the most complex relationship to the cranial nerves of any artery and it is frequently exposed in approaches directed to the fourth ventricle. It usually arises at the anterolateral margin of the medulla oblongata close to the lower cranial nerves.
It has a variable course, passing backward to be distributed to the anterior part of the. It arises from the basilar artery on each side at the level of the junction between the medulla oblongata and the pons in the brainstem. It develops as a branch of the longitudinal neural system, a forerunner of the. The anterior inferior cerebellar artery (AICA) is one of three pairs of arteries that supplies blood to the cerebellum. The posterior inferior cerebellar artery (PICA) is the largest branch of the vertebral artery. Anterior Inferior Cerebellar Artery (AICA) Evolution and Embryology: Unlike PICA, which can be conceptualized as a cervical artery impressed into posterior fossa service by expanding needs of the cerebellum, the AICA is a true cerebellar and brainstem artery.
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