Vertebral arteries

Vertebral artery
The vertebral arteries arise from the subclavian arteries, unite as the basilar artery, and supplies blood to parts of the brain
The branches of the subclavian artery and the course of the vertebral artery in the neck (schematic).
Details
Source	subclavian arteries
Branches	Meningeal branches Posterior spinal Anterior spinal PICA Basilar artery
Vein	vertebral vein
Supplies	Upper spinal cord, brainstem, cerebellum, posterior part of brain
Identifiers
Latin	arteria vertebralis
MeSH	A07.231.114.839
Dorlands /Elsevier	a_61/12156505
TA	A12.2.08.002
FMA	3956
Anatomical terminology []

The vertebral arteries are major arteries of the neck. They arise as branches from the subclavian arteries and merge to form the single midline basilar artery. As the vertebrobasilar system, they supply blood to the upper spinal cord, brainstem, cerebellum, and posterior part of brain.

The vertebral arteries arise from the subclavian arteries, one on each side of the body, then enter deep to the transverse process at the level of the 6th cervical vertebrae (C6), or occasionally (in 7.5% of cases) at the level of C7. They then proceed superiorly, in the transverse foramen of each cervical vertebra. Once they have passed through the transverse foramen of C1 (also known as the atlas), the vertebral arteries travel across the posterior arch of C1 and through the suboccipital triangle before entering the foramen magnum.

Nunziante Ippolito, a Neapolitan physician, identified the "angle of Nunziante Ippolito" to find the vertebral artery, between the anterior scalene muscle and the longus colli muscle.

Inside the skull, the two vertebral arteries join to form the basilar artery at the base of the Pons. The basilar artery is the main blood supply to the brainstem and connects to the Circle of Willis to potentially supply the rest of the brain if there is compromise to one of the carotids. At each cervical level, the vertebral artery sends branches to the surrounding musculature via the anterior spinal arteries.