The plasma membrane of a muscle fiber is called the sarcolemma.

Sarcolemma

Plasma membrane of a muscle fiber; also forms the tubules of the T system involved in muscular contraction.

Plasma Membrane

The lipid bilayer that surrounds a cell, regulating the passage of substances in and out of the cell.

Muscle Fiber

A single muscle cell, typically long and cylindrical, which contracts to produce movement.