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1 后根内的传人纤维后根内的传入纤维据其外周来源和直径大小主要分为两类。其一是来自肌肉和腱器的触压觉感受器、毛囊的D、G、T类感受器以及皮肤的快适应和慢适应性机械感受器的粗有髓纤维;其二是来自皮肤温痛觉和内脏感觉传入的有髓细纤维和无髓纤维。两者在后根进入部一般可形成内、外侧束,前者位居内侧束,后者位居外侧束。但在猫发现上述两类纤维并不形成内、外侧束。在向脊髓灰质的投射过程中,内侧束内的纤维进入后索,并在后索内升降。而外侧束内的纤维则首先呈放射状到达Lis-
Incoming fibers in the posterior root The afferent fibers in the posterior root of the posterior root are mainly classified into two categories according to their source and diameter. One is the tactile receptors from the muscle and tendon, the D, G, T receptors from the hair follicles, and the skin-adapted and slow-adapted mechanoreceptors; the other is from the skin thermal pain and visceral sensation Injected myelinated and non-myelinated fibers. Both in the posterior root into the Department can generally form a medial and lateral bundle, the former located in the medial bundle, the latter in the lateral bundle. However, the cats found that the above two types of fibers do not form the inner and outer bundles. During the projection into the gray matter of the spinal cord, the fibers in the medial bundle enter the posterior cords and rise and fall in the posterior cords. The outer bundle of fibers first radial to reach Lis-