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FIG 3. Direction of LSAs.
A and B, Anterior (A) and medial (B) images. More medially located LSA (arrow) divides into two branches and has the more anterior direction of supply. More lateral LSA (arrowhead) arises as a single trunk and has the more posterior direction of supply.
C and D, Anterior (C) and superior (D) images. LSA arising from the A1-A2 junction (recurrent artery of Heubner, arrow) is directed anteriorly on the superior view. LSA arising from the superior division of the MCA (arrowhead) is directed posteriorly.
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