One categorization is by whether the nerve fibers are carrying sensory or motor information. Get instant access to this gallery, plus: Introduction to the musculoskeletal system, Nerves, vessels and lymphatics of the abdomen, Nerves, vessels and lymphatics of the pelvis, Infratemporal region and pterygopalatine fossa, Meninges, ventricular system and subarachnoid space, Striated muscle (exhibits cross striations), Visceral striated muscle (within specific soft tissues), Smooth muscle (doesnt exhibit cross striations). Intercalated discs contain three different types of cell-cell junctions: Fascia adherens junctions (anchoring junctions) where actin filaments attach thin filaments in the muscle sarcomeres to the cell membrane. A second feature of cardiomyocytes is the sarcomeres, which are also present in skeletal muscles. Cardiac muscle tissue, also known as myocardium, is a structurally and functionally unique subtype of muscle tissue located in the heart, that actually has characteristics from both skeletal and muscle tissues. The thicker the myelin, the faster the signal travels along the axon. Through this unique ability, muscle tissue allows the body, together with its parts and internal organs, to move and continuously adjust their shapes. These cookies track visitors across websites and collect information to provide customized ads. They appear as lines that transverse the muscle fibers perpendicularly when examined with a light microscope. Does skeletal muscle have branching fibers? It consists ofmononucleatefibers withtapered edges. Accessibility StatementFor more information contact us atinfo@libretexts.org. The myofilaments of cardiac muscle are arranged in a similar pattern to skeletal muscle, resulting in cross-striations. When a motor neuron is stimulated, all muscle fibers in its motor unit will contract. The remainder of the intercalated disc is composed of desmosomes. myelinate axons in the periphery. Identify the different types of neurons and glial cells and their functions. The predominant fiber type in a muscle is determined by the primary function of the muscle. Skeletal is voluntary muscles attached to bones. Voltage gated channels open and calcium ions are released in the sarcoplasm. These are involuntary reactions to external stimuli. Cardiac Muscle. However, exercise does NOT result in the formation of new muscle fibers. Intercalated discs support synchronized contraction of cardiac tissue. Hence, if intercalated discs are nit present in the cardiac muscles then they might not contract properly and thus blood would not be pumped efficiently to other organs. This content is covered in the assignment and reviewed and built upon in lecture. All content published on Kenhub is reviewed by medical and anatomy experts. Intercalated discs are complex structures that connect adjacent cardiac muscle cells. Regulate the inflammatory response to damage. Obtain a slide of smooth muscle tissue from the slide box. For example, contraction of the biceps muscle, attached to the scapula and radius, will raise the forearm.
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