Veebral aeries of both sides unite to form
Veebral aery curves round the ventrolateral aspect of the medulla obolongata between the root of hypoglossal nerve unite with its fellow at lower border of pons to form median basilar aery Bd chaurasias Human anatomy Volume 3 Sixth edition
Anterior spinal aery
Posterior spinal aery
Medullary aery
Basilar aery
General anatomy