transverse tubules
transverse tubules (T tubules) A series of infoldings of the plasma membrane (sarcolemma) of muscle fibres that envelop each myofibril at the Z line (see sarcomere). The T tubules transfer action potentials from the sarcolemma to the sarcoplasmic reticulum, which releases calcium ions into the cytosol causing contraction of the muscle fibres.
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Transfer
trans·fer • v. / transˈfər; ˈtransfər/ (-ferred , -fer·ring ) [tr.] move (someone or something) from one place to anoth…
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transverse tubules