Muscle Structure The Connective Tissue of Muscle 1

The Connective Tissue of Muscle 1. Deep Fascia- Surrounds the muscle and serves to

The Connective Tissue of Muscle §Near the connection to the bone or another muscle

Microscopic Structure of Muscle 1. Muscle Fiber– Single muscle cell – They are typically

Microscopic Structure of Muscle 3. Sarcoplasma- Cytoplasma of the muscle cell. § Hundreds of

Microscopic Structure of Muscle 4. Sarcomere: Basic structure and functional unit of skeletal muscle.

Arrangement of Filaments §Z-lines: Thin protein strands that run perpendicular to the fibers. They

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Muscle Structure

The Connective Tissue of Muscle 1. Deep Fascia- Surrounds the muscle and serves to support it and hold it together. 2. Epimysium-The outermost covering around the muscle, envelopes the entire muscle. 3. Perimysium- Divides muscle into components called fascicles (a collection of muscle cells). 4. Endomysium- Wraps around each individual muscle cell

Connective Tissue of Muscle

The Connective Tissue of Muscle §Near the connection to the bone or another muscle three layers of connective tissue come together. §They form the tendon which attaches the muscle to the bone. §Fibers from the tendon converge into the periosteum of the bone. §They are also surrounded by loose connective tissue and adipose tissue (serves as energy storage).

Microscopic Structure of Muscle 1. Muscle Fiber– Single muscle cell – They are typically the length of the muscle they form. – Contain many nuclei. 2. Sarcolemma- Plasma membrane of the muscle cell.

Microscopic Structure of Muscle 3. Sarcoplasma- Cytoplasma of the muscle cell. § Hundreds of mitochondria for energy needed for muscle contraction. § Sarcoplasmic Reticulum- Structure that stores calcium (Ca) for muscle contraction. § Transverse Tubules- Connects to sarcoplasmic reticulum, helps transport the calcium in the cell. § Myofilaments- Cords of protein which extend parallel throughout the muscle fibers. § Thick Filaments- Composed of Myosin (protein) § Thin Filaments- Composed of the proteins; Actin, Troponin, Tropomyosin.

Microscopic Structure of Muscle 4. Sarcomere: Basic structure and functional unit of skeletal muscle. Segment of protein fibers between Z-lines. Arrangement of filaments: They alternate thick and thin bands throughout the length of the fiber. §A-band: Area where thick and thin filaments overlap. §I-band: Region where only the thin filaments are present.

Arrangement of Filaments §Z-lines: Thin protein strands that run perpendicular to the fibers. They intersect the thin filaments at regular intervals connecting them on either side of the I -band. §H-zone: Area within A-band where thin filaments and thick filaments do not overlap. §M-line: Area within the H-zone that connects the thick filaments.

Sarcomere