ANAT 261 Lecture Notes - Papain, Basal Lamina, Desmocollin
6 Apr 2012
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Document Summary
Muscular tissue"s structure is closely related to its function. For example, sarcomeres of skeletal muscle give rise to characteristic striations. In multicellular organisms, movement is dependent on muscle fibers (specialized cells). They contract upon stimulation and are elongated in shape: muscle cells are elongated and contain a great deal of cytoplasmic filaments. Muscle originates from the mesoderm: differentiation by the ectoderms produces the skin nervous system and annexes, differentiation by the endoderm forms the digestive tract, differentiation of the mesoderm forms ct and muscular tissue. Differentiation occurs mainly by a process of cell lengthening and synthesis of myofibrillar proteins. There is specialized terminology in muscles for things we have already seen: sarcolemma means muscle cell membrane, sarcoplasm means muscle cell cytoplasm, sarcoplasmic reticulum means muscle er. There are three different types of muscle: smooth muscle, striates skeletal muscle and striated cardiac muscle.
