Fig. 8.

SMC orientations and arterial diameters in left carotid arteries at luminal pressures of 40, 80, and $100\mathrm{mmHg}$ ($\mathrm{circular}\mathrm{mean}\pm \mathrm{circular}\mathrm{SD}$ for ${\mathit{\Theta }}_{\mathrm{h}}$, ${\mathit{\Theta }}_{\mathrm{t}}$, and ${\mathit{\Theta }}_{\mathrm{i}}$; $\mathrm{arithmetic}\mathrm{mean}\pm \mathrm{SD}$ for ${\mathit{\kappa }}_1$, ${\mathit{\kappa }}_2$, and diameter). ${}^{\ast }p<0.05$ versus angle zero (Rayleigh test). ${}^{\#}p<0.05$ inner versus outer layer (Rayleigh or paired Student’s t test). ${}^{+}p<0.05$ for parameter difference between pressures (Rayleigh or paired Student’s t test). ${\mathit{\Theta }}_{\mathrm{h}}$, ${\mathit{\Theta }}_{\mathrm{t}}$, ${\mathit{\Theta }}_{\mathrm{i}}$, ${\mathit{\kappa }}_1$, and ${\mathit{\kappa }}_2$ are defined in Fig. 6. SD standard deviation, SMC smooth muscle cell