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Anterior Cerebral Artery

Surgical Correlation

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A, The lips of the anterior part of the interhemispheric fissure have been retracted to expose the branches of the pericallosal and callosomarginal arteries coursing around the genu of the corpus callosum. The callosomarginal artery arises anterior to the genu of the corpus callosum. The cortical branches (yellow arrow) pass around the superior margin to reach the lateral cortical surface. The A2 courses below the corpus callosum, the A3 courses around the callosal genu, and the A4 and A5 course above the corpus callosum. B, Enlarged view. A precallosal artery arises from the AComA adjacent to the left ACA and passes upward in front of the lamina terminalis and rostrum of the corpus callosum, sending branches to the diencephalon and corpus callosum along its course. C, Another specimen. The lips of the interhemispheric fissure have been retracted to expose a large precallosal artery that ascends around the genu to reach the upper callosal surface. D, The large precallosal artery has been retracted to the left and the lamina terminalis opened to expose the mamillary bodies in the floor of the third ventricle. E, The floor of the third ventricle has been opened to expose the apex of the basilar artery and origin of the P1s in the interpeduncular cistern at the posterior margin of the circle of Willis. (Images courtesy of AL Rhoton, Jr.)

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