Medial dissection of Left Occipital Lobe to show Optic Radiation.  The optic radiation originates from neurons in the lateral geniculate nucleus of the thalamus (not visible in this dissection).  Fibers in the inferior part of the radiation course anteriorly into the temporal lobe as Meyer's loop before turning posteriorly.  They then course through the white matter of the parietal and occipital lobes to reach the striate (calcarine or primary visual) cortex on the medial surface of the occipital lobe. The cingulate gyrus, cingulum, and corpus callosum can be observed on the midsagittal surface of the brain superior to the optic radiation. (Image courtesy of AL Rhoton, Jr.)