Geometry and kinematics of dog ribs.
Geometry and kinematics of dog ribs.
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狗肋骨的几何形状和运动学。
DOI：
10.1152/jappl.1989.67.2.707
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
Hoffman,EA
中科院分区：
文献类型：
--
作者：
Margulies,SS;Rodarte,JR;Hoffman,EA
采用快速多层计算机断层x线扫描技术对5只麻醉的比格犬进行扫描，以确定总肺活量（TLC）和功能残余容量（FRC）的肋骨方向。使用一个坐标系将一个平面适合于每根肋骨，在这个坐标系中，z轴大约与头尾方向对齐，x-z平面与矢状中平面一致。每个平面的方向用“泵柄”和“桶柄”角度来描述。在从TLC到FRC的肺部被动收缩过程中，肋骨向下和向内旋转。肋骨位移不均匀：桶柄运动在上肋占主导地位，泵和桶柄运动在下肋相等。在肋3 - 8处，TLC和FRC之间泵柄角度的变化约为6度，而随着肋数的增加，桶柄角度的变化从肋3处的16度减小到肋8处的6度。肋形通过对每个肋的数据拟合一个椭圆来描述；随着肋骨数量的增加，肋骨变得更大、更圆。
Five anesthetized supine beagle dogs were scanned using a fast, multislice computed tomographic X-ray technique to determine the orientation of the ribs at total lung capacity (TLC) and functional residual capacity (FRC). A plane was fit to each rib using a coordinate system in which the z-axis was aligned approximately cephalocaudally and the x-z-plane coincided with the sagittal midplane. The orientation of each plane was described by “pump-handle” and “bucket-handle” angles. The ribs rotated downward and inward during a passive deflation of the lungs from TLC to FRC. Rib displacement was not uniform: bucket-handle motion was predominant in the upper ribs, and pump- and bucket-handle motions were equal in the lower ribs. The change in the pump-handle angles between TLC and FRC was approximately 6 degrees for ribs 3–8, and the change in the bucket-handle angles decreased with rib number from 16 degrees for rib 3 to 6 degrees for rib 8. Rib shape was described by fitting an ellipse to the data for each rib; the ribs became larger and more circular with increasing rib number.