The telencephalon consists of a median part (lamina terminalis) and two lateral vesicles (cerebral hemispheres).
The lateral ventricles communicate with the cavity of the third ventricle through the interventricular foramina of Monro. During the 6th and 7th week, the basal part of the hemispheres expand, thus forming the corpus striatum (later divided into caudate and lentiform nucleus). The hemispheres cover the diencephalon, midbrain and hindbrain. Surface of the hemispheres forms the cerebral cortex.
In the region of attachment to the roof of diencephalon, the wall of the hemispheres remains very thin. The choroid plexus and the hippocampus form here. Further differentiation of the brain takes place after the embryonic period. |
