terminal cisterns

terminal cisterns
pairs of transversely oriented channels that are confluent with the sarcotubules, which together with an intermediate T tubule constitute a triad of skeletal muscle. See also T system, under system; T tubule, under tubule; and triad of skeletal muscle.

Medical dictionary. 2011.

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  • T tubules — the transverse intracellular tubules invaginating from the cell membrane and surrounding the myofibrils of the T system of skeletal and cardiac muscle, serving as a pathway for the spread of electrical excitation within a muscle cell, enabling… …   Medical dictionary

  • T system — tē . n the system of T tubules in striated muscle * * * a system of transverse tubular invaginations (T, or transverse, tubules) of the sarcolemma, each of which penetrates deep into the muscle fiber. In mammalian skeletal muscle, they are… …   Medical dictionary

  • triad of skeletal muscle — a pair of terminal cisterns in close apposition to the T tubule, running transversely across a myofibril of skeletal muscle; in mammalian muscle there are two triads to each sarcomere, situated at the A band–I band junction. See also T system,… …   Medical dictionary

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