1. It is the branch of 1st part of subclavian artery (Right and Left) and two in number.
2. Vertebral artery are divided into four part (from neck to head) that are given below-
a. Intracranial / Intradural part- It gives five branches. (See next point)
b. Extradural / atlantic part
c. Foraminal part- Present in foramen transversarium of C1 C2 C4 C5 and C6 vertebra.
d. Pre Foraminal part- It is extend from it’s origin (Subclavian artery) to C6 vertebrae.
NOTE: Both vertebral, and Internal carotid artery are divided into four parts (from neck to head).
3. Intracranial part of vertebral artery have five branches-
1. Anterior spinal artery– Supply to the spinal cord.
2. Posterior spinal artery– Supply to the spinal cord.
3. Meningeal branch– to the meninges.
4. Medullary artery– Supply to the medulla oblongata.
5. Posterior inferior cerebellar artery (PICA)– Supply to the cerebellum.