<prompt> Third pa of veebral aery is related to which marked area in the following diagramABCD  <response>: Marked structures are as follows: A: Posterior arch of atlas; B: Foramen transversarium; C: Anterior arch; D: Superior aicular facet. Veebral aery has 4 pas: V1 - Preforaminal from subclan aery to transverse foramen of C6 V2 - Foraminal through the transverse foramina of C6 to C2 V3 - Extradural from the transverse foramen of axis to the veebral canal V4 - Intradural from the veebral canal to the inferior border of pons The given diagram is atlas veebra superior view and marker A shows the posterior arch of atlas, which is related to the third pa of veebral aery. 