This section is from the book "Anatomy Of The Arteries Of The Human Body", by John Hatch Power. Also available from Amazon: Anatomy of the Arteries of the Human Body, with the Descriptive Anatomy of the Heart.
The Basilar Artery, formed by the union of the two vertebral arteries, proceeds from behind forwards on the middle line, between the nerves of the sixth pair, one of which lies on each side, having the cuneiform process of the occipital bone beneath it, and the pons Varolii or great commissure of the cerebellum above it. In this course it gives off the following branches:—
Transverse. Superior Cerebellar.
Anterior Cerebellar. Posterior Cerebral.
The Transverse Branches are few in number and small: they are distributed to the pons, and to the auditory nerve.