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Surrounding each muscle fiber (cell) is a delicate external lamina composed primarily of reticular fibers. This external lamina is produced by the muscle fiber and, when observed through the light microscope, cannot be distinguished from the cell membrane of the muscle fiber, the sarcolemma.
Nerves also contain fascicles (fasciculi), which are covered by perineurium, and contain neurons. Additional labels of structures upon and within a muscle. A muscle fiber and muscle cell are synonymous. The cell membrane of a muscle fiber is the sarcolemma.The Z line is often called the Z disk. At rest, the troponin-tropomyosin complex blocks the active sites of the actin proteins, which prevents attachment of the cross-bridges of the thick (myosin) filaments. Makeup of the sarcoplasm.erves also contain fascicles (fasciculi), which are covered by perineurium, and contain neurons. Additional labels of structures upon and within a muscle. A muscle fiber and muscle cell are synonymous. The cell membrane of a muscle fiber is the sarcolemma.