Nervous stimulation of skeletal muscle results in a wave of depolarization along the plasma membrane.This electrical signal is carried into the interior of the muscle cell via the membranes of the:

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The T-tubules, or transverse tubules, are invaginations of the plasma membrane that penetrate deep into the muscle cell. They allow the depolarization signal to reach the sarcoplasmic reticulum, which then releases calcium ions to initiate muscle contraction. The intercalated disks are found in cardiac muscle, the nuclear envelope surrounds the nucleus and is not directly involved in muscle contraction, and the sarcomere is the basic contractile unit of muscle but does not directly transmit electrical signals.

Nervous Stimulation of Skeletal Muscle Results in a Wave of Depolarization