Abstract
The tunica media and intima of descending thoractic aortas from commercially killed pigs showed variations in mechanical properties along their length in a region extending from just in front of the first intercostal artery to the sixth intercostal artery. Along this region circumferential toughness, measured as work of fracture from a tear test, increased, longitudinal and circumferential ultimate tensile strength increased and longitudinal and circumferential stress-strain gradients of excised strips increased further away from the heart. These increasing mechanical properties are positively correlated with an increase in collagen mass fraction and an increase of radius/thickness ratio away from the heart over this region.
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