Final answer:
The sarcolemma is the muscle cell membrane, with sarcoplasm being the cytoplasm of muscle cells, encapsulated by the endomysium on a micro-scale.
Step-by-step explanation:
The muscle cell membrane is called the sarcolemma. This structure is the site of action potential conduction, which triggers muscle contraction. Within skeletal muscle cells, the sarcolemma is surrounded by various connective tissues. These include the endomysium, which encases each muscle fiber, the perimysium, which organizes muscle fibers into bundles called fascicles, and the epimysium, which surrounds the whole muscle. Muscle fibers contain a cytoplasm known as sarcoplasm and are composed of many fibrils, giving the cells their striated appearance. These components are all critical to the structure and function of skeletal muscle fibers.