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. Gross anatomy Origin The PICA is a paired artery that originates from the vertebral artery V4 segment. It is the most variable and tortuous cerebellar artery. 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. Posterior inferior cerebellar artery (PICA) is one of the three vessels that provide arterial supply to the cerebellum. 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. Like other structures in the central nervous system, the cerebellum consists of grey matter and white matter: Grey matter located on the surface of the cerebellum. It usually arises at the anterolateral margin of the medulla oblongata close to the lower cranial nerves. According to the National Institute of Neurological Disorders and Stroke, Wallenberg Syndrome (aka Lateral Medullary Syndrome or Posterior Inferior Cerebellar Artery Syndrome) is a neurological condition caused by a blockage of the vertebral artery (VA) or posterior inferior cerebellar artery (PICA), ultimately leading to infarction of the later. Anatomical Structure and Divisions The cerebellum consists of two hemispheres which are connected by the vermis, a narrow midline area. The cerebellum is just above the brainstem and controls coordination of. The VA, arising from the subclavian artery, is classically divided into 4 segments. The anterior inferior cerebellar artery is located in the cerebellum of the brain. We identified most of SCA compression from superior, most of AICA from. Seventeen of these lesions originated from the PICA-vertebral junction, and four arose from distal PICA branching sites. PICA is the most common artery compressing the inferior cranial nerves from superior. The posterior inferior cerebellar artery (PICA) is the largest branch of the vertebral artery. The posterior inferior cerebellar artery (PICA) usually originates from the vertebral artery (VA) at an average distance of approximately 16 or 17 mm below the vertebrobasilar junction 1, 2. The clinical and anatomical features of 21 surgically treated saccular aneurysms of the posterior inferior cerebellar artery (PICA) are analyzed.
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