Duda P, Pavlásek J
Physiol Bohemoslov. 1976;25(6):495-503.
The functional characteristics of the intraspinal spread of the dual-component viscerosomatic reflex response were studied in chloralose-anaesthetized cats. In the region of the direct inputs of splanchnic afferents into the spinal cord, the initial part of the early (propriospinal) component is evoked by afflux from the extraspinal pathway in the sympathetic chain and has the shortest latent period. At segment Th8 to Th12 level this was 5.2--8.1 msec; cranially and caudally from this level it was longer. Activity spreading from the adjacent segments via intraspinal longitudinal systems also participates in the origin and course of the early component of the efferent discharge. The rate of ascending intraspinal irradiation in the thoracic region was 3.2--12 m/sec (6.6 +/- 2.4 m/sec). The rate of the descending spread of propriospinal activity in the thoracic region via intraspinal pathways was 3.6--18.3 m/sec (12.5 +/- 4.5 m/sec); in the lumbar region it was significantly lower -- 2.9--19.3 m/sec (7 +/- 4.5 m/sec). The latent period of the later component varied from 20 to 30 msec and displayed a cranio-caudal increase in length. The rate of the descending spread of the later component in the thoracic and lumbar cord did not differ significantly (20 +/- 10 m/sec and 22 +/- 13 m/sec respectively). The continuous splanchnic discharge in the lumbosacral region is correlated to the different rate of the intraspinal spread of the early and the late response and to their overlapping.
在水合氯醛麻醉的猫身上研究了双组分内脏躯体反射反应脊髓内传播的功能特征。在内脏传入神经直接投射到脊髓的区域，早期（脊髓固有）成分的起始部分由交感神经链中脊髓外通路的传入冲动诱发，潜伏期最短。在胸8至胸12节段水平，潜伏期为5.2 - 8.1毫秒；在此水平以上和以下，潜伏期更长。从相邻节段经脊髓内纵向系统传播的活动也参与传出放电早期成分的起源和过程。胸段脊髓内上行辐散的速度为3.2 - 12米/秒（6.6±2.4米/秒）。脊髓固有活动经脊髓内通路在胸段下行传播的速度为3.6 - 18.3米/秒（12.5±4.5米/秒）；在腰段则明显较低，为2.9 - 19.3米/秒（7±4.5米/秒）。后期成分的潜伏期为20至30毫秒，且从颅侧向尾侧长度增加。后期成分在胸段和腰段脊髓下行传播的速度无显著差异（分别为20±10米/秒和22±13米/秒）。腰骶部区域持续的内脏放电与早期和晚期反应脊髓内传播的不同速度及其重叠有关。
