True about veebral aery ?

Ans. is 'b' i.e., Enters skull through foramen magnum Veebral aery It is the largest branch of subclan aery. Veebral aery traverses through veebral triangle, foramina transversaria of upper six cervical veebrae, suboccipital triangle, posterior atlanto-occipital membrane, veebral canal, pierce duramater and arachnoid (Subarachnoid) and passes through foramen magnum to enter posterior cranial fossa. It gives following branches:- Cervical branches :- Spinal branches, muscular branches (to suboccipital muscle). Cranial branches :- Posterior inferior cerebellar aery, medullary aery, meningeal branches, anterior spinal aery, posterior spinal aery and both veebral aeries unite to form basilar aery.