The Classical Pathways of Occipital Lobe Epileptic Propagation Revised in the Light of White Matter Dissection

Figure 2

(a) Lateral view of the right hemisphere once the MLF and the insular cortex have been resected. The Inferior fronto-occipital fasciculus (IFOF) is completely exposed at the level of the external capsule (ExC). The posterior originating branches run from precuneus (PreCu), cuneus (Cu), occipital pole (OP) region, and lingula (Li) within the sagittal stratum of Sachs (SSS) towards the frontal lobe. Light blue dotted lines represent the spatial distribution of the posterior termination of the IFOF. (b) After the resection of the IFOF on the lateral surface of the brain, the optic radiation (OR) is exposed within the deep part of the SSS. According to Alvarez et al. [35] the dark blue line represents the anterior margin of the dorsal component of the OR, which will end at the level of the dorsal portion of extrastriate visual cortices (V2 and V3). The orange dotted line represents the anterior margin of the ventral component of the OR fibres that runs inferiorly and lateral with respect to the lateral ventricle to end at the level of primary visual cortex (V1). M1: primary motor cortex (precentral gyrus); IC: internal capsule; AF: arcuate fasciculus fibres left as superficial landmark.

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