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The relationship of the posterior inferior cerebellar artery to cranial nerves VII–XII
Author(s) -
Saylam C.,
Ucerler H.,
Orhan M.,
Cagli S.,
Zileli M.
Publication year - 2007
Publication title -
clinical anatomy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 71
eISSN - 1098-2353
pISSN - 0897-3806
DOI - 10.1002/ca.20541
Subject(s) - posterior inferior cerebellar artery , cranial nerves , anatomy , medicine , medulla oblongata , vertebral artery , hypoglossal nerve , accessory nerve , cerebellar artery , fourth ventricle , anterior inferior cerebellar artery , glossopharyngeal nerve , vagus nerve , tongue , surgery , central nervous system , aneurysm , pathology , stimulation , endocrinology
The posterior inferior cerebellar artery (PICA) is the largest branch of the vertebral artery. It usually arises at the anterolateral margin of the medulla oblongata close 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. The aim of this article is to describe the anatomical relationship of the PICA to the lower cranial nerves. 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. 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 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 findings on the relationship of the PICA to the lower cranial nerves could be helpful in microsurgery of this region. Clin. Anat. 20:886–891, 2007. © 2007 Wiley‐Liss, Inc.