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Medical Definition of Sharpey's fiber. : any of the thready processes of the periosteum that penetrate the tissue of the superficial lamellae of bones.
Type I Fibers Type I fibers, also known as slow twitch oxidative muscle fibers, are primaritly responsible for maintenance of body posture and skeletal support. The soleus is an example of a predominantly slow-twitch muscle fiber.t is important to emphasize the point that this process is not creating more skeletal muscle fibers (in humans), but increasing the size and number of contractile proteins (actin and myosin) within the muscle fiber (see Table 1. for a summary of changes that occur to muscle fibers as they hypertrophy).