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Methacrylate-embedded E15 embryo (posterior coronal)

Figure 40 is a slightly more posterior coronal slice of the E15 forebrain through the lumen of the lateral ventricle and through a large part of the olfactory nerve contact zone.  The olfactory NEP is tentatively identified in a ventromedial position (the dorsal part might also be the septal NEP); the dorsolateral NEP is tentatively identified as the neocortical NEP.  Large spindle shaped cells are prominent in the ventral part of the olfactory primordium, while smaller cells are migrating out of the medial parts of the NEP—these may be the AOB output neurons contacting the medial fibers in the nerve contact zone that are probably mostly from the vomeronasal nerve.