大鼠腋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 AXILLARY NERVE TO THE SUBSTANTIA GELATINOSA OF THE SPINAL CORD IN RATS——AN ACID PHOSPHATASE TECHNIQUE STUDY

按照跨神经节溃变的原理,以酸性磷酸酶法,研究了大鼠腋神经感觉纤维在脊髓胶状质的定位投射。大鼠腋神经感觉纤维纵向投射,主要至脊髓C_0上段至C_8下段胶状质,少数动物还投射至C_5下段及T_1上段。其横向投射均在胶状质中线以外,主要位于胶状质外侧半内侧和中1/3区域,部分动物C_7至C_8节段的投射区,占据胶状质外侧半内侧1/2范围。投射柱从上至下有向外扩展趋势。

The orientational projections of the sensory fibres of axillary nerve to the substantia gelationsa (SG) of the spinal cord in rats were studied in accordance with the principle of transgangionic degeneration by using acid phosphatase technique. It was found that the afferent fibers of the axillary nerve projected chiefly to SG from the upper part of C_6 to the lower part of C_8 longitudinally. In a few rats, projections extended to the lower part of C_5 and upper part of T_1. In comparison with the available studies, a tendency of backward localization was noted. As to their transverse projections, the afferent fibres of the axillary nerve were found outside of the midline of SG, and mainly located in the lateral half of SG, at the 1/3 of median and the 1/3 of interior region. In the segments of C_7C_8 of some rats, the medial. 1/2 of the lateral half of SG was projected. It was found that the projection column from up downward had a tendency of extension toward lateral portion.