Methacrylate-embedded E22 embryo in the horizontal plane (intermediate)

Figure 139 is an intermediate slice through the MOB in the same specimen as Figure 138 that cuts the olfactory recess, a thin sliver of the olfactory NEP/ependyma, the dense olfactory SVZ and the immature and maturing parts of the MOB granule cell layer.  The migratory stream of mitral cells is still visible on the lateral side of the bulb flowing out of the lateral olfactory tract as it spreads into the internal plexiform layer.  Fewer spindle-shaped cells are in the medial internal plexiform layer.  The base of the mitral cell layer is easily distinguished from the internal plexiform layer because fewer cells are entering from below.