The rostrum is named for its resemblance to a bird's beak. The lower much thinner part is the rostrum and is connected below with the lamina terminalis, which stretches from the interventricular foramina to the recess at the base of the optic stalk. The genu curves downward and backward in front of the septum pellucidum, diminishing greatly in thickness. The front part of the corpus callosum, towards the frontal lobes is called the genu ("knee"). Fibres from the trunk and the splenium known together as the tapetum form the roof of each lateral ventricle. A narrowed part between the trunk and the splenium is known as the isthmus. These are the rostrum, the genu, the trunk or body, and the splenium. The corpus callosum has four main parts individual nerve tracts that connect different parts of the hemispheres. Part of the corpus callosum forms the roof of the lateral ventricles. The corpus callosum forms the floor of the longitudinal fissure that separates the two cerebral hemispheres.
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