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The trigeminal motor root was studied in the electron microscope at different proximodistal levels in eight adult cats. Counts at a level halfway between the trigeminal ganglion and the pontine junction showed that the root contains about 9% (n = approximately 300) unmyelinated axon profiles at this level. Small groups of unmyelinated axons occur on both sides of the PNS-CNS border, in the surrounding pia mater, and in perivascular spaces of the CNS compartment. Examination of serial sections from the PNS-CNS transitional region showed that some unmyelinated axons actually cross the PNS-CNS border. The functional significance of these fibres remains unknown.
Anat Rec 1986 Feb
PMID:Unmyelinated axons in the feline trigeminal motor root. 395 76

The interaction of nasal morphology and climatic conditions has resulted in diverse hard- and soft-tissue configurations across human population groups. While the processes of skull pneumatization are not fully understood, the invasions of the paranasal sinuses [PNS] into the cranium have contributed to assorted morphologies. Human migratory patterns and the strong association with climatic variables through time and space may explain this diversity. This study examined four multiregional populations of which two are from Egypt but of widely divergent eras. Three Egyptian mummies [EG-M] from the middle kingdom were CT scanned providing a unique opportunity to investigate the status of PNS anatomy within a time frame from 1567 BCE to 600 CE and compare it to a contemporary Egyptian [EG] (n = 12) population. Dry skulls of Inuit [IT] (n = 10) and East African [EA] (n = 8) provide out-group comparisons, as one group represents an isolated geographic environment far different from that of Egypt and the other group inhabiting distinct environmental conditions albeit located within the same continent. Results showed EG-M and EG frontal sinus volumes were diminutive in size with no statistically significant difference between them. Maxillary sinus size values of EG-M and EG clustered together while IT and EA significantly differed from each other (P = 0.002). The multiregional groups exhibited population specific morphologies in their PNS anatomy. Ecogeographic localities revealed anatomical differences among IT and EA, while the potential time span of about 3,500 years produced only a negligible difference between the Egyptian groups. The small sample sizes incorporated into this research requires confirmation of the results by analyses of larger samples from each geographic region and with the integration of a larger group of Egyptian mummified remains.
Anat Rec (Hoboken) 2015 Jun
PMID:CT Examination of Nose and Paranasal Sinuses of Egyptian Mummies and Three Distinct Human Population Groups: Anthropological and Clinical Implications. 2599 41