Veebral aeries are derived from:
The veebral aeries are derived from the subclan aeries. They ascend through the neck in the foramina transversaria of the upper six cervical veebrae and enter the cranial cavity through the foramen magnum, close to the anterolateral aspect of the medulla Ref: Gray's anatomy 40th edition, Chapter 17.
Axillary aery
Subclan aery
Internal carotid aery
None of the above