Fig. 37 Outer retina adjacent to the optic nerve. The astrocyte sheathing (As) between the two structures forms the intermediary tissue of Kuhnt. The pigment epithelium (PE) ends with three or four immature or undifferentiated types of cells followed by receptor and Müllercells (M). The paradisc receptors are immature cones. Their axons sweep away from the optic nerve to join the outer nuclear layer (ONL) more peripherally. Br, Bruch's membrane; ELM, external limiting membrane. (Uga S: Some structural features of the retina Mülleriancells in the juxtaoptic nerve region. Exp Eye Res 19:105, 1974)