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Investigations on the ventral axis and strain distribution in bending aimed to experimentally establish the neutral axis position, because it offers significant information and helps in establishing the stress-strain association of various layers of the vessel wall. In a linear range of the stress-strain association including the zero-stress state and the no-load state, the Young's modulus of the adventitial layer is 4.70 plus or minus 1.72 kPa, but the Young's modulus of the intima-media layer of the pig thoracic aorta is 43.2 plus minus 15.8 kPa.