"cisternal segment: extends from its origin until the choroidal fissure; measures ~2.5 cm (range 1.5-3.5 cm) in length. It passes through carotid cistern, crural cistern and ambient cistern before reaching the choroidal fissure 6,7."
"The AChA can be divided into two segments:"
"hyperplastic AChA in which AChA supplies the area usually associated with PCA"
Expected headings
"Segments"
"Vascular territory"
"The AChA originates from the posterior wall of the internal carotid artery (ICA) between the origin of the posterior communicating artery (PCOM) (which is 2-5 mm proximal to the AChA) and the internal carotid termination (which is 2-5 mm distal to the AChA). It measures ~1 mm in diameter."
"cisternal segment: extends from its origin until the choroidal fissure; measures ~2.5 cm (range 1.5-3.5 cm) in length. It passes through carotid cistern, crural cistern and ambient cistern before reaching the choroidal fissure 6,7."