猫后肢肌肉中的骨骼-梭内运动轴突。
Skeleto-fusimotor axons in the hind-limb muscles of the cat.
作者信息
Emonet-Dénand F, Jami L, Laporte Y
出版信息
J Physiol. 1975 Jul;249(1):153-66. doi: 10.1113/jphysiol.1975.sp011008.
Abstract
- Motor axons supplying various hind-limb muscles of the cat (flexor hallucis lingus, peroneus brevis, peroneus digiti quinti, tibialis anterior, soleus and tenuissimus) were identified as skeleto-fusimotor or beta axons because their repetitive stimulation elicited both the contraction of extrafusal muscle fibres and an increase in the rate of discharge of spindle primary endings which perisited after selective blockade of extrafusal neuromuscular junctions. 2. The conduction velocity of these axons ranged from 39 to 92 m/sec. 3. Of seventy-six beta axons, seventy-two had a dynamic action on the sensitivity to velocity of stretching of primary endings, four had a static action. 4. The dynamic action of six beta axons was observed only after the contraction of extrafusal muscle fibres was selectively suppressed. 5. Tendon organs can be activated by beta motor units.
摘要
- 支配猫后肢不同肌肉（拇长屈肌、腓骨短肌、小趾展肌、胫骨前肌、比目鱼肌和最薄肌）的运动轴突被鉴定为骨梭运动轴突或β轴突，因为对它们的重复刺激既引起了梭外肌纤维的收缩，又引起了梭内初级终末放电频率的增加，而这种增加在选择性阻断梭外神经肌肉接头后仍持续存在。2. 这些轴突的传导速度在39至92米/秒之间。3. 在76条β轴突中，72条对初级终末对拉伸速度的敏感性有动态作用，4条有静态作用。4. 仅在选择性抑制梭外肌纤维收缩后，才观察到6条β轴突的动态作用。5. 腱器官可由β运动单位激活。
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