Inspiratory elevation of the ribs in the dog: primary role of the parasternals.
Inspiratory elevation of the ribs in the dog: primary role of the parasternals.
复制标题
狗的肋骨吸气抬高：胸骨旁的主要作用。
DOI：
10.1152/jappl.1991.70.4.1447
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
DeTroyer,A
中科院分区：
文献类型：
--
作者：
DeTroyer,A
为了评价不同组吸气肋间肌群对犬肋骨颅侧运动的相对贡献，我们在15只静息呼吸的麻醉动物上，测量了第四肋骨的轴向位移，并记录了胸骨旁肋间、肋外和提肋骨第三间隙的肌电。在8只动物中，胸骨旁肋间1-5间隙失神经。此手术使肋间和提肋骨外吸气活动量显著增加，但肋骨吸气时的颅动减少了55%。另有7只动物切断肋骨间隙1~5的外肋骨，颅骨肋骨活动度仅减少22%，但胸骨旁和提肋骨活动量无明显变化。当这些动物的胸骨旁神经随后被切断时，提肋骨的吸气活动显著增加，但肋骨的吸气颅动被取消或反转为吸气尾部运动。因此，这些研究证实，在狗的静息呼吸中，胸骨旁肋骨比外部肋间和提肋骨在吸气时引起肋骨的头颅运动中具有更大的作用。一项定量分析表明，胸骨旁的贡献约为80%。
To assess the relative contributions of the different groups of inspiratory intercostal muscles to the cranial motion of the ribs in the dog, we have measured the axial displacement of the fourth rib and recorded the electromyograms of the parasternal intercostal, external intercostal, and levator costae in the third interspace in 15 anesthetized animals breathing at rest. In eight animals, the parasternal intercostals were denervated in interspaces 1-5. This procedure caused a marked increase in the amount of external intercostal and levator costae inspiratory activity, and yet the inspiratory cranial motion of the rib was reduced by 55%. On the other hand, the external intercostals in interspaces 1-5 were sectioned in seven animals, and the reduction in the cranial rib motion was only 22%; the amount of parasternal and levator costae activity, however, was unchanged. When the parasternals in these animals were subsequently denervated, the levator costae inspiratory activity increased markedly, but the inspiratory cranial motion of the rib was abolished or reversed into an inspiratory caudal motion. These studies thus confirm that, in the dog breathing at rest, the parasternal intercostals have a larger role than the external intercostals and levator costae in causing the cranial motion of the ribs during inspiration. A quantitative analysis suggests that the parasternal contribution is approximately 80%.