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Tendon cells synthesize the tendon's extracellular matrix, which abounds with densely-packed collagen fibers. The collagen fibers run parallel to each other and are grouped into fascicles. Each fascicle is bound by an endotendineum, which is a delicate loose connective tissue containing thin collagen fibrils [4] [5] and elastic fibers. [6]
Many of the muscle fibers end within the muscle and do not connect to the tendon directly, thus necessitating a force transmission pathway via the endomysium. The planar network of the collagen fibers appears to be randomly distributed at first glance, but detailed analysis has shown that the network is not truly random and that there is a ...
An aponeurosis (/ ˌ æ p ə nj ʊəˈr oʊ s ɪ s /; pl.: aponeuroses) is a flattened tendon [1] by which muscle attaches to bone or fascia. [2] Aponeuroses exhibit an ordered arrangement of collagen fibres, thus attaining high tensile strength in a particular direction while being vulnerable to tensional or shear forces in other directions. [1]
When this part of the protein is missing, the structure of type I collagen is compromised. Tissues that are rich in type I collagen, such as the skin, bones, and tendons, are affected by this change. Ehlers–Danlos type IV is most attributed to abnormalities in the reticular fibers (collagen Type III).
The body of the Golgi tendon organ is made up of braided strands of collagen (intrafusal fasciculi) that are less compact than elsewhere in the tendon and are encapsulated. [2] The capsule is connected in series (along a single path) with a group of muscle fibers ( 10-20 fibers [ 3 ] ) at one end, and merge into the tendon proper at the other.
The fibers are mainly composed of type I collagen. Crowded between the collagen fibers are rows of fibroblasts, fiber-forming cells, that generate the fibers. Dense connective tissue forms strong, rope-like structures such as tendons and ligaments. Tendons attach skeletal muscles to bones; ligaments connect bones to bones at joints.
Limited tests have been done on the tensile strength of the collagen fiber, but generally it has been shown to have a lower Young's modulus compared to fibrils. [55] When studying the mechanical properties of collagen, tendon is often chosen as the ideal material because it is close to a pure and aligned collagen structure. However, at the ...
Type I collagen is the most abundant collagen of the human body, consisting of around 90% of the body's total collagen in vertebrates. Due to this, it is also the most abundant protein type found in all vertebrates. Type I forms large, eosinophilic fibers known as collagen fibers, which make up most of the rope-like dense connective tissue in ...