T tubule

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tu·bu·lus trans·ver'·sus

a tubular invagination of the sarcolemma of skeletal or cardiac muscle fibers that surrounds myofibrils as the intermediate element of the triad in skeletal muscle and the diad in cardiac muscle; involved in transmitting the action potential from the sarcolemma to the interior of the myofibril.
Synonym(s): T tubule

T tu·bule

(tū'byūl)
The transverse tubule that passes from the sarcolemma across a myofibril of striated muscle; it is the intermediate tubule of the triad.
References in periodicals archive ?
In order to enter into the muscle cell, glucose delivered by blood flow must be transported across the surface membrane and the T-tubule membranes into the cytoplasm, where it is trapped by hexokinase II action [58].
The majority of GLUT4-containing vesicles do not move long distances but are depleted locally in the surface membrane or T-tubule regions [8, 74].
The mammalian T-tubule membranes are highly enriched in cholesterol and sphingolipids [9] endowing them with a rigid lipid environment with highly restricted membrane fluidity properties [10].
The cholesterol content of the T-tubule membrane in skeletal muscle is significantly higher than the levels present in the plasma membrane of most cells.
Laporte, "T-tubule biogenesis and triad formation in skeletal muscle and implication in human diseases," Skeletal Muscle, vol.