title: The use of ligament efficiency to model fenestrations in the internal elastic lamina of cerebral arteries. II--analysis of the spatial geometry.
abstract: During uniaxial extension of the latex model, the holes (both marked on the sheet and perforated) demonstrated a distinctive change in their shape, from circular to elliptical. Measurements of the axial and transverse diameters of a consistent row of holes, along with the width of the sample at distinct elongations were converted into an area, ligament efficiency (transverse and axial) and shape factor (eccentricity). Values for the expansion ratio of the holes and necking of the latex sheet were also computed. The perforations expanded more rapidly than with the holes only marked on the solid material, which translated into a more rapid increase for the axial diameter, area and eccentricity, while the axial ligament efficiency decreased more rapidly. The transverse diameter and transverse ligament efficiency remained essentially constant. Necking of the latex sheet was consistent for all of the specimens (both solid and perforated). The relative expansion ratios paralleled the relative changes for the standardized stresses presented in Part I.
mesh_terms: D001696:Biomechanical Phenomena; D002536:Cerebral Arteries / Q000502:physiology / Q000648:ultrastructure*; D004547:Elastic Tissue / Q000502:physiology / Q000648:ultrastructure*; D006801:Humans; D007840:Latex; D008954:Models, Biological
chemical_list: D007840:Latex