Türk Nöroşirürji Dergisi 2023 , Vol 33 , Num 3
Demonstration of Corona Radiata by Fiber Dissection Technique
Mustafa Eren YÜNCÜ1
1Sağlık Bilimleri Üniversitesi, Tepecik Eğitim ve Araştırma Hastanesi, Beyin ve Sinir Cerrahisi Kliniği, İzmir, Türkiye The white matter structures of the brain consists of 3 main fiber types. These are; asociation fibers connecting different regions of the same cerebral hemisphere, commissural fibers connecting the two hemispheres along the midline, and projection fibers connecting the cortex and the caudal parts of the brain and the spinal cord by moving up and down along the neuroaxis. The corona radiata fibers are the terminal part of the projection fibers located at the superior part of the frontal and parietal lobes that reach the cortex. The external and internal capsule fibers combine to form the corona radiata, which moves towards the frontal and parietal lobes at the level of the upper border of the putamen, and form the centrum semiovale with the callosal fibers. White matter dissection of the cerebrum from lateral to medial starts with the decortication process. After the removal of the cortex in the frontoparietal region, the short asociation fibers (U fibers) are removed. When the U fibers are removed, the superior longitudinal fasciculus II (SLF II) fibers, which have the appearance of a thick mass extending longitudinally in the frontoparietal region, are seen. By showing the external and internal capsule fibers, which are the continuation of the corona radiata inferiorly, the three-dimensional anatomical structure of the corona radiata is revealed more clearly. Lentiform nuclei are removed to visualize the internal capsule, which constitutes the majority of the corona radiata. When the internal capsule fibers are followed superiorly, the radial view of the corona radiata fibers is clearly revealed. Anahtar Kelimeler : White matter pathways, Corona radiata, Fiber dissection