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In striated muscle, sarcoplasmic reticulum is a type of endoplasmic reticulum specially adapted to surround the myofibrils, forming dyads in cardiac muscle and triads in skeletal muscle with invaginations of the plasma membrane called T-tubules.

The sarcoplasmic reticulum contains large stores of calcium, which it sequesters and then releases when the cell become depolarised.<ref name="sarcoplasmic">Toyoshima C, Nakasako M, Nomura H, Ogawa H. (2000, June 8). Crystal structure of the calcium pump of sarcoplasmic reticulum at 2.6 A resolution. Nature. 405(6787):647-55.</ref> This has the effect of triggering muscle contraction.

[edit] References

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[edit] External links

• MeSH Sarcoplasmic+reticulum
• Histology at BU 21602loa - "Ultrastructure of the Cell: sarcoplasm of skeletal muscle, sarcoplasmic reticulum and mitochondria"
• Diagram at bgsu.edu
• Physiology at MCG 2/2ch3/communic

Muscle tissue v • d • e</div>

skeletal muscle/general: epimysium, fascicle, perimysium, endomysium, muscle fiber, myofibril sarcomere (a, i, and h bands; z and m lines), myofilaments (thin filament/actin, thick filament/myosin, elastic filament/titin), tropomyosin, troponin neuromuscular junction, intrafusal muscle fibers, extrafusal muscle fiber, motor unit, muscle spindle, sliding filament mechanism myoblast, satellite cells, sarcoplasm, sarcolemma, sarcoplasmic reticulum, T-tubule cardiac muscle: myocardium, intercalated disc smooth muscle: calmodulin, vascular smooth muscle

de:Sarkoplasmatisches Retikulum