Although aponeuroses share some structural similarities with free tendons, they probably undergo a more complex loading regime.
Many aponeuroses cover a substantial portion of the muscle belly Fig. It is well accepted that when muscles contract and fibres shorten, the muscle expands in other dimensions to maintain a constant volume.
The image of a flexing bodybuilder is a familiar reminder that muscles change shape when they contract. Given the close association of aponeuroses with the muscle belly, it is reasonable to predict that shape changes in a contracting muscle may also deform the aponeurosis along multiple axes.
This pattern of stretch indicates that the aponeurosis is loaded biaxially. To appreciate the functional significance of biaxial loading, consider a case where the tissue is only loaded in one direction. In contrast, under biaxial loading the tissue is prevented from shortening, and with enough loading can be stretched in two dimensions.
Biaxial loading requires more force for a given stretch Fig. What this means for muscle is that the effective stiffness of the tendon spring is greater in the longitudinal direction than would be expected for uniaxial loading Fig. We were able to test the idea that biaxial loading increases the effective stiffness of aponeurosis by comparing the aponeurosis stiffness during active and passive force production. When the muscle was loaded passively by stretching it to long lengths , the aponeurosis shortened in the orthogonal direction, as expected for uniaxial loading Fig.
The stiffness measured under these conditions was significantly lower than the stiffness measured for biaxial loading during active force production Fig. The effects of biaxial loading may explain previously published results that were considered difficult to reconcile with a model of the aponeurosis as a uniaxially loaded spring.
Variable stiffness in aponeuroses may have important implications for movement. The use of stiffness values based on uniaxial material properties may underestimate the elastic energy stored in aponeuroses during active contractions. Variable stiffness may also have implications for motor control.
Difference between aponeurosis and tendon. Difference Between Similar Terms and Objects. MLA 8 P, Rachita. Name required. Email required.
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Moreover, some tendons are round while some are flattened. Tendons allow our body to move and be flexible. The aponeurosis is another white colour connective tissue that attaches a muscle to bone. However, aponeurosis is a delicate tissue containing thin sheaths.
When a muscle moves by flexing or extending, an aponeurosis functions like a spring to bear the extra pressure and tension. It is due to the recoiling ability of aponeurosis. Moreover, aponeurosis helps the body to be strong and stable. Tendon is a tough rope-like connective tissue that attaches a muscle to the bone while aponeurosis is a delicate sheath-like connective tissue that attaches a muscle to a bone.
So, this is the key difference between tendon and aponeurosis. Furthermore, one other significant difference between tendon and aponeurosis is that the tendons allow the body to move and be flexible, while aponeurosis allows the body to be strong and stable. The below infographic provides more details on the difference between tendon and aponeurosis.
In summary, tendon and aponeurosis are two connective tissues that carry out the same major function of attaching muscles to bones. However, the tendon is a tough rope-like structure while aponeurosis is a delicate thin sheath-like structure.
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