Abstract
The transient layer of Chievitz appears between the inner and outer neuroblastic layers of the developing retina from six to about nine weeks of gestation in Macaca mulatta. Electron micrographs of this layer show that it is composed of intertwined neuronal and Mùˆllerian cell processes in monkey, human, and rabbit fetuses. As the zone disappears by the sclerad migration of the inner neuroblastic nuclei, portions of the layer of Chievitz probably become a part of the inner plexiform layer. A few cell junctions appear at this stage, suggestive of very early synapses.