In order to evaluate the full significance of the syndrome of the posterior inferior cerebellar artery, a comprehensive knowledge of the anatomy of the region involved is of paramount importance.
The vertebral artery arises from the first branch of the subclavian artery on each side. The course of the artery may be divided into four portions. The fourth portion extends from its entrance into the vertebral canal, through the foramen magnum, to the point where it unites with its fellow of the opposite side to form the basilar artery (fig. 1). During its course about the spinal cord the artery enters and traverses the arachnoid and, gaining the subarachnoid space, passes gradually upward and inward to the middle of the caudal border of the ventral surface of the pons, where it meets and anastomoses with its fellow.
The medulla oblongata is supplied by the posterior inferior cerebellar and by the
CINELLI AA. SYNDROME OF THE POSTERIOR INFERIOR CEREBELLAR ARTERY. Arch Otolaryngol. 1942;36(1):108–119. doi:10.1001/archotol.1942.03760010118010
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