The lateral ventricle and the inner nuclear region
Promemoria: The CNS begins as the neural tube with a central cavity. The ventricle system arises from the anterior end of the central canal. The mighty development of the cerebral hemispheres leads to a profound transformation of the lateral ventricle. During their arch-shaped extending, the hemispheres take the ventricle space along, making the lateral ventricles also take on the typical rostroventrally-opened horseshoe form.
With the pallium, the lateral ventricle completes the shape alterations and releases processes into the frontal lobe (anterior horn s. frontal), into the temporal lobe (inferior horn s. temporal) as well as into the occipital lobe (posterior horn s. occipital). In the adjacent nerve tissue lies the caudate nucleus that arches itself into the ventricle space. It takes on the same horseshoe shape so that in a frontal section it is met with twice.
By these shape alterations the putamen that lies below the insula is affected only slightly and is thus increasingly surrounded by the caudate nucleus.
The pallidum remains spared from the rotation movements.
The choroid plexus (green) arises only in the central part (pars centralis) of the lateral ventricle. The anterior, posterior and inferior horns miss the plexus.