Chorioid plexus in sheep and goat: A scanning electron microscopy study of the foetuses

The surface of the chorioid plexus in sheep and goat foetuses from day 62 to 145 of their foetal development was studied using the scanning electron microscope. No changes were found in the structure of the chorioid plexus surface in sheep and goat foetuses in relation to their age or gender. The chorioid plexus surface was covered predominantly with microvilli, sporadic short cilia or their clusters, which often occurred in the fourth cerebral ventricle. Secretory protrusions in the lateral and third cerebral ventricle were rare, but the occurrence of epiplexus (supraependymal) cells at these sites was abundant. There were abundant secretory protrusions on the surface of the fourth cerebral ventricle unlike the other parts of the ventricular system of the brain. However, epiplexus cells did not occur at this site.