Skeletal Muscle Fiber

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Sarcolemma
Plasma membrane of a muscle cell.
Surrounds muscle fiber and regulates entry and exit of materials
sarcoplasm
cytoplasm of a muscle fiber
Sarcoplasmic reticulum
Smooth endoplasmic reticulum in a muscle fiber.
Stores CALCIUM ions needed for muscle contraction
Mitochondria
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T-Tubules
Narrow, tubular extensions of the sarcolemma into the sarcoplasm, contacting the terminal cisternae; wrapped around myofibrils
Quickly transports a muscle impulse from the sarcolemma throughout the entire muscle fiber
Myofibrils
Organized bundles of myofilaments; cylindrical structures as long as the muscle fiber itself.
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