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¹Bezmialem Dragos Hastanesi, Beyin ve Sinir Cerrahisi Kliniği, İstanbul, Türkiye The Sagittal Stratum is a projection fiber system formed by multiple fiber bundles, the extension of the corona radiata in the occipital and temporal region. Inferior longitudinal fascicle and Optic radiation are part of this fiber system. The sagittal stratum covers the lateral surface of the temporal horn and atrium of the lateral ventricle from the posterior border of the insula. The sagittal stratum contains fibers located between the arcuate/superior longitudinal fascicle fibers and the tapetal fibers originating from the splenium deep. In the gradual Sagittal Stratum fiber dissection, there are 5 layers from lateral to medial. There are middle longitudinal fascicle in the upper superficial part, inferior longitudinal fascicle in the lower, inferior frontal occipital fascicle ventrally at the level of the external capsule, and claustrocortical fibers dorsally, posterior leg of the anterior commissure, optic radiation fibers course with retrolenticular internal capsule fibers, posterior thalamic peduncle fibers. The inferior longitudinal fascicle is part of this fiber bundle. Anahtar Kelimeler : Sagittal stratum, Inferior longitudinal fascicle, Fiber dissection