Leblond H, Cabana T
Département de Sciences Biologiques, Université de Montréal, Qué., Canada.
Acta Anat (Basel). 1996;155(3):194-9. doi: 10.1159/000147804.
A quantitative light-microscopic analysis of the ventral and dorsal roots at the C8 and L4 segments of the spinal cord was made in the opossum, Monodelphis domestica, to evaluate the number of myelinated fibers and their class distribution, and will serve as a baseline to a study of myelinogenesis in that species. In male opossums, the C8 ventral root comprises an average of 595 myelinated fibers (70.3% alpha: 29.7% gamma) and the dorsal root 1,124 fibers (29.4% type I: 41.2% type II: 29.4% type III). The L4 ventral root has an average of 831 fibers (57.9% alpha: 42.1% gamma), and the dorsal root 2,079 fibers (17.4% type I:44.7 type II: 37.9% type III). The females have less fibers but their size and class proportions are comparable to those of the males. These data are discussed in relation to peripheral innervation and are compared to those reported for the rat and the cat.
对家负鼠（Monodelphis domestica）脊髓C8和L4节段的腹根和背根进行了定量光学显微镜分析，以评估有髓纤维的数量及其类别分布，并将作为该物种髓鞘形成研究的基线。在雄性负鼠中，C8腹根平均包含595条有髓纤维（α纤维占70.3%：γ纤维占29.7%），背根有1124条纤维（I型占29.4%：II型占41.2%：III型占29.4%）。L4腹根平均有831条纤维（α纤维占57.9%：γ纤维占42.1%），背根有2079条纤维（I型占17.4%：II型占44.7%：III型占37.9%）。雌性的纤维较少，但其大小和类别比例与雄性相当。结合外周神经支配对这些数据进行了讨论，并与大鼠和猫的相关数据进行了比较。
