These are about 8 nm in diameter and, being the thinnest of the cytoskeletal filaments, are also called microfilaments. (In skeletal muscle fibers they are called thin filaments.) Some functions of actin filaments: 1  form a band just beneath the plasma membrane that.  provides mechanical strength to the cell.
Muscle tissue varies with function and location in the body. In mammals the three types are: skeletal or striated muscle; smooth or non-striated muscle; and cardiac muscle, which is sometimes known as semi-striated.n vertebrates, there is a third muscle tissue recognized: 1  Cardiac muscle (myocardium), found only in the heart, is a striated muscle similar in structure to skeletal muscle but not subject to voluntary control.
Non-striated Muscle. As the name implies, non-striated muscle lacks visible striations. Smooth muscle is the only muscle of this type and without striations, other less obvious characteristics are used to identify this tissue.Before we examine smooth muscle in longitudinal or cross-section, it might be worth our while to determine why some myofibers are striated while others are not.mooth muscle is found in walls of hollow organs and blood vessels where contractility and stretch are both specific needs. Think of the bladder or the uterus of a pregnant female.