These data indicate that the appearance of Mn in olfactory tissues cannot be due to soluble Mn but, rather, that solid UFP transport occurs efficiently.
This led us to establish three morphogenetic periods characterized by the appearance of pioneer neurons along the olfactory pathway (pioneer period), the massive migration of cells along the olfactory fibers (migratory period), and the acquisition of the mature organization (maturing period) (see Table 2).
While these inclusions are present in the substantia nigra in the later stages of PD development (i.e. when PD can be clinically diagnosed), the inclusions have been shown to appear in other structures of the brainstem, e.g. anterior olfactory structures and the medulla oblongata [ 3] prior to their appearance at the substantia nigra.
In scans taken between the appearance of the cerebellum and the disappearance of the olfactory bulbs, brain volumes were extracted by manually outlining regions of interest and multiplying by slice thickness (0.5 mm).
Despite the normal appearance of the mouse head, especially the nose, the olfactory epithelium was severely reduced in size in E13.5 N-myc −/− mutants [ Fig. 4(A)].
It is interesting to note that in dogfish embryos at stage 24, shortly after the appearance of pioneer neurons, early postmitotic neurons located within the olfactory epithelium extended their axons (DCX-ir) to contact with the telencephalon, which represent the earliest evidence of olfactory projections.
The sequential appearance of classical symptoms and signs of Bell's palsy, without olfactory disturbance we observed, are consistent with progressive interference of peripheral (not central nervous system) facial nerve function by a process initiated during retrograde axonal transport.
The extremities of the brain cavity were defined as the appearance of the cerebellar subarachnoid space, and the disappearance of the olfactory bulbs.
D. There are two likely explanations for the appearance of a nuclear ring in some of our IF images: 1) olfactory neurons have a single or small number of large central chromocenters that are not stained with anti-FLAG antibodies, leading to the appearance of stronger staining on the nuclear periphery (for example, see Figure 13D).
Indeed, the other pathological changes observed are widespread, with the appearance of LB inclusions in different areas of the brain (mesostriatal system, cortex, thalamus, hypothalamus, olfactory bulb or brainstem), or alterations in the autonomic system (the spinal cord, sympathetic ganglia and myenteric plexus in the gastrointestinal tract).
