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The optic lobe of the oval squid, S. lessoniana. A, Live specimen. Dashed outlines depict a pair of optic lobes located behind the eyes. B, Schematic diagram showing the position of the optic lobe (gray area) relative to the eye in the lateral view of the oval squid. C, Dissected left optic lobe showing the medial view of the optic lobe, where the site of the optic tract can be seen (dented area). A, Anterior; P, posterior; D, dorsal; V, ventral. Scale bars: A, 1 cm; C, 0.5 cm.
