A, Inferior view. The lower part of the right temporal pole has been removed to expose the AChA, which passes backward to reach the medial side of the optic tract where it turns laterally, passing again below the optic tract and around the uncus to enter the temporal horn. B, Lateral view. The right AChA arises above the origin of the PComA and passes upward and backward around the uncus to reach the temporal horn.  C, Medial side of the right uncus. The AChA passes around the medial aspect of the uncus to reach the lower end of the choroidal fissure where it enters the temporal horn. The PCA courses along the posterior aspect of the uncus. D, The PCA has been removed. The AChA ascends along the anterior segment of the uncus to reach the uncal apex where it turns laterally above the posterior uncal segment to enter the inferior choroidal point at the lower end of the choroidal fissure located just behind the posterior uncal segment and the head of the hippocampus. The anterior uncal segment contains the amygdala and the posterior segment is formed predominantly by the head of the hippocampus. E, Medial view of the right AChA in another specimen. The cross section extends through the midline of the sella. The view is directed laterally over the top of the sella to the medial aspect of the internal carotid artery, uncus, and the origin of the AChA. The AChA passes around the uncus to reach the lower end of the choroidal fissure. F, Medial view of another temporal lobe. The AChA pursues an angulated course, descending along the anterior segment of the uncus, but at the uncal apex it turns sharply upward, reaching the upper part of the posterior uncal segment before entering the temporal horn. (Images courtesy of AL Rhoton, Jr.)