The broad sheet of connective tissue in the lower back that the latissimus dorsi muscles (the “lats”) fuse into is an example of an aponeurosis.Įvery skeletal muscle is also richly supplied by blood vessels for nourishment, oxygen delivery, and waste removal. In other places, the mysia may fuse with a broad, tendon-like sheet called an aponeurosis, or to fascia, the connective tissue between skin and bones. The tension created by contraction of the muscle fibers is then transferred though the connective tissue layers, to the tendon, and then to the periosteum to pull on the bone for movement of the skeleton. At the other end of the tendon, it fuses with the periosteum coating the bone. In skeletal muscles that work with tendons to pull on bones, the collagen in the three connective tissue layers intertwines with the collagen of a tendon. The endomysium surrounds the extracellular matrix of the cells and plays a role in transferring force produced by the muscle fibers to the tendons. Inside each fascicle, each muscle fiber is encased in a thin connective tissue layer of collagen and reticular fibers called the endomysium. This fascicular organization is common in muscles of the limbs it allows the nervous system to trigger a specific movement of a muscle by activating a subset of muscle fibers within a fascicle of the muscle. Inside each skeletal muscle, muscle fibers are organized into bundles, called fascicles, surrounded by a middle layer of connective tissue called the perimysium. Muscle fibers are covered by the endomysium. Figure 10.2.1 – The Three Connective Tissue Layers: Bundles of muscle fibers, called fascicles, are covered by the perimysium. The epimysium also separates muscle from other tissues and organs in the area, allowing the muscle to move independently. Each muscle is wrapped in a sheath of dense, irregular connective tissue called the epimysium, which allows a muscle to contract and move powerfully while maintaining its structural integrity. Each skeletal muscle has three layers of connective tissue that enclose it, provide structure to the muscle, and compartmentalize the muscle fibers within the muscle ( Figure 10.2.1). These tissues include the skeletal muscle fibers, blood vessels, nerve fibers, and connective tissue.

Explain the sliding filament process of muscle contractionĮach skeletal muscle is an organ that consists of various integrated tissues.Identify the regions of the sarcomere and whether they change during contraction.List the major sarcomeric proteins involved with contraction.

Define a muscle fiber, myofibril, and sarcomere.

Describe the connective tissue layers surrounding skeletal muscle.

Describe the structure and function of skeletal muscle fibersīy the end of this section, you will be able to:

Interactive physiology muscular system