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¹Sağlık Bakanlığı Bingöl Devlet Hastanesi, Beyin ve Sinir Cerrahisi Kliniği, Bingöl, Türkiye The corpus callosum is the largest and main commissural fiber bundle connecting the same projection areas in the cerebral hemispheres. It is the main pathway involved in hemispheric synchronization of epileptic seizures and constitutes one of the main targets in epilepsy surgery. Since the corpus callosum covers the surface of the lateral ventricles, it gains importance in lateral ventricular surgeries. For these reasons, understanding the microsurgical anatomy of the corpus callosum is important in determining the direction and extent of callosotomy in intraventricular approaches and in epilepsy surgeries. The corpus callosum can be divided into anterior and posterior parts according to the borders of the anterior and posterior parts of the callosal body. The posterior callosal body, isthmus, and genu segments of the corpus callosum are formed the posterior corpus callosum. The posterior part of the callosal body and the splenium form tapetum fibers that run antero-infero-laterally on the medial upper wall of the atrium. The splenium form the forceps major is in close relationship with the isthmic cingulum fibers. Anahtar Kelimeler : Callosal body, Isthmus, Splenium, Tapetum, Cingulum