Deep inward extensions of the sarcolemma form a tunnel-like network inside the muscle cell known as:

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Quizplus · Accepted Answer

Deep inward extensions of the sarcolemma form transverse tubules (T-tubules) inside the muscle cell. Myofibrils are bundles of protein filaments inside the muscle cell, the sarcoplasmic reticulum is a specialized type of smooth endoplasmic reticulum found in muscle cells that stores and releases calcium ions, and myofilaments are the protein filaments that make up myofibrils.

Deep Inward Extensions of the Sarcolemma Form a Tunnel-Like Network