Schraufnagel D E, Roussos C, Macklem P T, Wang N S
Microvasc Res. 1983 Nov;26(3):291-306. doi: 10.1016/0026-2862(83)90078-x.
The diaphragm may differ from other skeletal muscles in certain blood flow characteristics. We attempted to determine if this could be accounted for by structural differences in the microvasculature. We compared coded specimens of the diaphragm to the intercostals and triceps in rats by a cast corrosion, scanning electron microscopic study. For the comparison we first quantitatively described the vasculature by measuring the angles, distances, and diameters. We also tabulated subjective, descriptive, recurring patterns. We then performed frequency analysis by vessel diameter, correlation, and factor analysis to obtain the description. Arteries and veins of greater than 50 microns diameter have structural characteristics of a conducting system, namely, infrequent, single branching at obtuse angles whereas the vessels from about 15 to 50 microns in diameter have greater branching and frequently splay into many smaller streams. The capillaries form arcades and dichotomize with Y- and psi-shaped branches. The best predictor of branching (distance, angle, and pattern) is the trunk diameter. Individual and combinations of measurements and patterns comparing the diaphragm to the triceps and intercostals pointed out no convincing difference in these structural aspects of microvasculature of these muscles.
膈肌在某些血流特性方面可能与其他骨骼肌不同。我们试图确定这是否可以用微血管系统的结构差异来解释。通过铸型腐蚀扫描电子显微镜研究，我们将大鼠膈肌的编码标本与肋间肌和肱三头肌进行了比较。为了进行比较，我们首先通过测量角度、距离和直径来定量描述血管系统。我们还将主观的、描述性的、反复出现的模式制成表格。然后，我们通过血管直径、相关性和因子分析进行频率分析以获得描述。直径大于50微米的动脉和静脉具有传导系统的结构特征，即分支稀少，以钝角单分支，而直径约15至50微米的血管分支较多，且经常分支成许多较小的分支。毛细血管形成拱廊，并以Y形和ψ形分支进行二分。分支（距离、角度和模式）的最佳预测指标是主干直径。将膈肌与肱三头肌和肋间肌进行比较的测量值和模式的个体及组合表明，这些肌肉微血管系统的这些结构方面没有令人信服的差异。
