Definition: Heterotaxis is a concept in biomechanics and engineering that describes how different parts of an organism move, such as a muscle or a joint. It refers to the movement of two or more distinct parts within a single organism, where one part is attached to another without any direct communication or exchange. This can occur due to differences in their mechanical properties, such as stiffness or elasticity, which allow them to move independently but require each other for support and stability.