大鼠正中神经感觉纤维在脊髓胶状质的定位投射——酸性磷酸酶法研究

THE ORIENTATIONAL PROJECTIONS OF SENSORY FIBRES OF MEDIAN NERVE TO THE SUBSTANTIA GELATINOSA OF THE SPINAL CORD IN RATS——AN ACID PHOSPHATASE TECHNIQUE

本实验按照跨神经节溃变的原理,以酸性磷酸酶法研究了大鼠正中神经感觉纤维在脊髓胶状质内的定位投射。大鼠正中神经感觉纤维纵向投射主要至脊髓C_(5)上段至T_(1)中段胶状质;少数动物还投射至C_(4)中、下段及T_(1)下段。与解剖学专著的记载及HRP法研究的结果相比,有“前置”的趋势。其横向投射均在胶状质中线以内,且主要位于胶状质内侧半的内侧1/4~1/2区域;少数动物C_(7)~T_(1)上段的投射区占居胶状质内侧半全部范围。投射柱从上至下有向外扩展的趋势。

The orientational projections of sensory fibres of median nerve to the Substantia Gelatinosa(SG)of the spinal cord in rats were studied in accordance with the principle of transganglion degeneration by using the acid phosphatase technique.It was found longitudinally that the afferent fibres of the median nerve projected chiefly to SG from the upper part of C_(5)to middle part of T_(1).In a few rats,projections extended to middle and lower part of C_(4)and lower part of T_(1).In comparison with the records in anatomy literature and data from researches with HRP technique,a tendency of pre-positioning was noted.The regional projections of the afferent fibres of median nerve were found within the centre line of SG,and mainly in the region of the medial 1/4-1/2 of the medial half.In the segments of C_(7)-T_(1)of a few rats,the whole area of the medial half of SG was projected.In observing the projections of the afferent fibres of median nerve,it was found that they have a tendency of lateralward increase from cranial portion to caudal portion.