Fig. (8) Lungfish. Cerebral vasculature of Australian lungfish Neoceratodus modified after Spencer [73] shows the cerebral carotids (CCA) and an intercarotid commissure (Com) arising from anterior carotids (ACA). The CCAs divide into ACC and PCC divisions within the braincase. The PCCs continue as paired basilars (pBAs) that give off transverse branches. Posterior carotid arteries (PCAs), which represent remnants of the original ICA trunk, extend rostrally from the paired dorsal aorta and continue as the orbital arteries (Orbs) without connecting with the CCA.