Common Causes of Pinched Nerves. The most common forms of nerve compression are in the spinal joints where either a disc bulge or a bony arthritic spur can irritate and compress the nerve. Compressions can also occur as the nerve passes through or around muscles. Your physiotherapist will know where to look.
Muscle fibers are in turn composed of myofibrils. The myofibrils are composed of actin and myosin filaments, repeated in units called sarcomeres, the basic functional units of the muscle fiber.The sarcomere is responsible for the striated appearance of skeletal muscle, and forms the basic machinery necessary for muscle contraction.n addition to the actin and myosin components that constitute the sarcomere, skeletal muscle fibers also contain two other important regulatory proteins, troponin and tropomyosin, that are necessary for muscle contraction to occur.
There are two types: MYOSIN-thick filaments ACTIN-thin filaments. Structure of a SARCOMERE (functional unit of a muscle). Actin and Myosin filaments are arranged in an overlapping pattern of light (I bands) and dark (A bands). In the middle of each I band is a line called a Z line.The section of a myofibril from one Z-line to the next Z-line is the SARCOMERE.. Muscle and Muscle Fiber Structure: A muscle is composed of many muscle fibers (muscle fiber = muscle cell). The individual muscles are separated from each other and held in place by a covering called the FASCIA.