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  2. T-tubule - Wikipedia

    en.wikipedia.org/wiki/T-tubule

    T-tubules (transverse tubules) are extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells.With membranes that contain large concentrations of ion channels, transporters, and pumps, T-tubules permit rapid transmission of the action potential into the cell, and also play an important role in regulating cellular calcium concentration.

  3. Terminal cisternae - Wikipedia

    en.wikipedia.org/wiki/Terminal_cisternae

    Terminal cisternae are discrete regions within the muscle cell. They store calcium (increasing the capacity of the sarcoplasmic reticulum to release calcium) and release it when an action potential courses down the transverse tubules, eliciting muscle contraction. [2]

  4. Sarcoplasmic reticulum - Wikipedia

    en.wikipedia.org/wiki/Sarcoplasmic_reticulum

    Cardiac and skeletal muscle cells contain structures called transverse tubules (T-tubules), which are extensions of the cell membrane that travel into the centre of the cell. T-tubules are closely associated with a specific region of the SR, known as the terminal cisternae in skeletal muscle, with a distance of roughly 12 nanometers, separating ...

  5. Triad (anatomy) - Wikipedia

    en.wikipedia.org/wiki/Triad_(anatomy)

    In the histology of skeletal muscle, a triad is the structure formed by a T tubule with a sarcoplasmic reticulum (SR) known as the terminal cisterna on either side. [1] Each skeletal muscle fiber has many thousands of triads, visible in muscle fibers that have been sectioned longitudinally. (This property holds because T tubules run ...

  6. Diad - Wikipedia

    en.wikipedia.org/wiki/Diad

    The dyad is the connection of transverse- tubules and the junctional sarcoplasmic reticulum (jSR). [1] Like skeletal muscle contractions, Calcium (Ca 2+) ions are required for polarization and depolarization through a voltage-gated calcium channel. The rapid influx of calcium into the cell signals for the cells to contract.

  7. Muscle cell - Wikipedia

    en.wikipedia.org/wiki/Muscle_cell

    Cardiac muscle like the skeletal muscle is also striated and the cells contain myofibrils, myofilaments, and sarcomeres as the skeletal muscle cell. The cell membrane is anchored to the cell's cytoskeleton by anchor fibers that are approximately 10 nm wide. These are generally located at the Z lines so that they form grooves and transverse ...

  8. Cav1.1 - Wikipedia

    en.wikipedia.org/wiki/Cav1.1

    In skeletal muscle it associates with the ryanodine receptor RyR1 of the sarcoplasmic reticulum via a mechanical linkage. It senses the voltage change caused by the end-plate potential from nervous stimulation and propagated by sodium channels as action potentials to the T-tubules. It was previously thought that when the muscle depolarises, the ...

  9. Skeletal muscle - Wikipedia

    en.wikipedia.org/wiki/Skeletal_muscle

    Structure of muscle fibre showing a sarcomere under electron microscope with schematic explanation Diagram of sarcoplasmic reticulum with terminal cisternae and T-tubules. Skeletal muscle exhibits a distinctive banding pattern when viewed under the microscope due to the arrangement of two contractile proteins myosin, and actin – that are two ...