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  • Title: Organization of the infraorbital nerve in rat: a quantitative electron microscopic study.
    Author: Jacquin MF, Hess A, Yang G, Adamo P, Math MF, Brown A, Rhoades RW.
    Journal: Brain Res; 1984 Jan 02; 290(1):131-5. PubMed ID: 6692128.
    Abstract:
    The normal organization of the rat's infraorbital (IO) nerve was studied using conventional electron microscopic (EM) methods. Just caudal to the infraorbital foramen, at the level of the anterior superior alveolar foramen, the nerve was composed of 18-25 fascicles which ranged from 575 to 87,923 micron2 in cross-sectional area. Complete axon counts from thin sections taken at this level demonstrated that the IO nerve contained an average of 19,740 (S.D. = 2054) myelinated and 13,319 (S.D. = 1159) unmyelinated axons. The average diameter (including the myelin sheath) for medullated fibers was 4.42 micron (S.D. = 1.76) and that for unmyelinated axons was 0.60 micron (S.D. = 0.16). The fiber diameter distributions for both myelinated and unmyelinated axons were essentially unimodal.
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