【答案】:C
。①根据神经纤维兴奋传导速度的差异,可将神经纤维分A、B、C3类,其中A类纤维再细分为
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/0ff41bd5ad6eddc40556f0632bdbb6fd536633f0?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
个亚类。根据神经纤维的直径和来源不同,可将神经纤维分为I、Ⅱ、Ⅲ、IV4类,其中I类纤维再细分为Ia、Ib两个亚类。②牵张反射是指骨骼肌受到外力牵拉时
引起受牵拉的同一肌肉收缩的反射活动。牵张反射有腱反射和肌紧张两种类型。腱反射和肌紧张的感受器均为肌梭。肌梭的传入神经为Ia类和Ⅱ类纤维,两类纤维均终止于脊髓前角的
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/ac6eddc451da81cb6f57c7554066d016082431f0?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
运动神经元,
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/80cb39dbb6fd5266899a788cb918972bd50736f0?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
运动神经元发出的
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/38dbb6fd5266d01653a8dab0852bd40734fa35f0?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
传出纤维支配梭外肌(第95题答案为A)。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/d1160924ab18972b898b4452f4cd7b899f510af0?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
运动神经元发出的
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/aa18972bd40735fab9410a218c510fb30e2408f0?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
传出纤维支配梭内肌,以加强肌梭的敏感性。③内脏疼痛属于慢痛,经C类纤维传人,主要投射到扣带回(第96题答案为C)。B类纤维为有髓自主神经节前纤维。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/e7cd7b899e510fb36ca8330fcb33c895d0430cf0?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
纤维为皮肤触压觉的传入纤维。