Muscle Tissue-24

Muscle Tissue-24 - Chapter 24 Microscopic Anatomy of the...

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Chapter 24 Microscopic Anatomy of the Skeletal muscle
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Skeletal muscle fibers l Sarcolemma (cell membrane) l Sarcoplasm (muscle cell cytoplasm) ¡ Myoglobin stores oxygen l Sarcoplasmic reticulum (modified ER) ¡ Stores calcium l Myofibrils (made up of myofilaments) ¡ Actin or thin filament ¡ Myosin or tick filament
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Skeletal muscle fibers l Transverse tubule – it is the invagination of the sarcolemma. l Terminal cisternae- it is the expanded terminal area of the sarcoplasmic reticulum l Triad- formed by one T tubule plus one terminal cisternae on each side of it.
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The Structure of a Skeletal Muscle Fiber
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Skeletal muscle fibers l Sarcomeres – it is the contractile unit of the muscle. From Z disc to Z disc. l I band – formed by thin filaments only ¡ Z disc – in the middle of the I band. It anchors the thin filament and connects each myofibril to the next.
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Skeletal muscle fibers l A band- formed by thin and thick filaments that overlap.
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Muscle Tissue-24 - Chapter 24 Microscopic Anatomy of the...

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