大鼠颈7神经根及其束支运动纤维含量与分布特点的研究

STUDY ON THE QUANTITY AND DISTRIBUTION OF MOTOR FIBER OF RAT'S C_7 NERVE ROOT

目的了解大鼠C7神经根各束支运动纤维含量及其功能定位,为临床选择神经供体提供依据。方法雄性SD大鼠30只,采用显微解剖方法将大鼠C7及其所属束支、上肢各神经终支分离,测量各束支截面积及计数运动纤维含量。结果大鼠C7神经根前股发出一定数量的运动纤维到肌皮神经、正中神经,总量约207根,但在C7前股定位不明确;后股发出相应的运动纤维束支到桡神经、腋神经与胸背神经,总量约323根,这些束支在C7后股的定位较明确。C7神经根所支配的范围很广,其中以C7后股发出的胸背神经束支支配的背阔肌占比例最大(运动纤维含量>50%)。结论大鼠C7神经根前、后股束支、运动纤维分布与人类相似,是研究C7神经根选择性移位较好的动物模型。

Objective To investigate the quantity and distribution of motor fiber of rat＇s C; nerve root. Methods Motor fiber quantity and section area in the main nerves of the upper extremity and the fascicles of C7 in 30 SDrats were analyzed. Results Fascicles and certain amount （207） of motor fibers from the anterior division Of C7 were distributed to musculocutaneous nerve and median nerve, the orientation of these fibers were not clear. The ones （323） from posterior division were to the axillary, radial, and dorsal thoracic nerves, thus the orientation of these fascicles was relatively definite. Conclusion The distribution of the motor fibers and fascicles in the divisions of C7 in rat is similar to human beings, so rat is a relatively good model for the study of selective C7 nerve root transfer.