connecting branch of vessel supplies blood to Homo sapiens subclavian artery vertebral artery https://upload.wikimedia.org/wikipedia/commons/f/ff/Vertebral_artery.png The two vertebral arteries and the basilar artery are sometimes together called the vertebrobasilar system, which supplies blood to the posterior part of circle of Willis and anastomoses with blood supplied to the anterior part of the circle of Willis from the carotid arteries. [WP,unvetted] VHOG:0000263 ZFA:0005033 EHDAA2:0002192 GAID:518 NCIT:C12819 FMA:3956 MA:0002077 Wikipedia:Vertebral_artery UBERON:0001535 The first branch of the left and right subclavian arteries that merge to form the single midline basilar artery; branches of the vertebral arteries supply the musculature of the neck. SCTID:181323003 UMLS:C0042559 MESH:D014711 EHDAA:5328 vertebral arteries TAO:0005033 EMAPA:17314 arteria vertebralis spinal cord spinal artery