MUSCLE ANATOMY NOTES

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MUSCLE ANATOMY NOTES
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MICROSCOPIC ANATOMY OF SKELETAL MUSCLE

• Muscle cells are called muscle fibers myofibers
• Sarcolemma specialized muscle cell membrane
• Sarcoplasm cytoplasm of muscle cell

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• Sarcoplasmic reticulum specialized smooth
  endoplasmic reticulum, storage release of
  calcium when muscle contracts
• fuse to form cisternae

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• Transverse Tubules (T-tubules)
• Infoldings of sarcolemma that penetrate into
  muscle fiber filled with extracellular fluid

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• Myofibers bundles of myofibrils
• Myofibrils bundles of myofilaments
• Thin filaments primarily actin
• Thick filament myosin
• contain cross bridges (links thin thick
  filaments

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• Sarcomeres basic, functional units muscle,
  sections of myofibers
• extends from Z line to Z line
• I band light band (thin filament only)
• Z line dark midline of I band

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• A band dark band (thick and thin filaments)
• H zone lighter central area of A band (thick
  filaments only)
• M line central line of H zone

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