The surface of plexus chorioideus of the fourth, third and lateral ventricle and in the region of the foramen interventriculare of adult goats of both sexes was studied using scanning electron microscopy. It was found that the convex apical membranes on the whole surface of the plexus chorioideus are covered with microvilli or microvillus-like structures. The presence of cilia was not recorded. Abundant spherical protrusions occurred in the region of lateral cerebral ventricle, and were almost absent in the region of the foramen interventriculare. The epiplexal cells occurred in the fourth and lateral ventricle only sporadically; they could be seen in higher number in the third ventricle and in the region the foramen interventriculare. Some epiplexal cells had a large number of filiform processes; most of these macrophage-like cells had only 3-5 pseudopodia with "ruffled" membranes. No differences which would be connected with sex or season were found in the structure of the plexus chorioideus.