Myofibril Anatomy

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Across
  1. 4. the innermost layer of connective tissue surrounding an individual muscle fiber
  2. 6. the outermost layer of connective tissue surrounding the entire muscle
  3. 8. the line at the center of the sarcomere to which myosin bind
  4. 9. also known as isotropic bands, the light band of the sarcomere containing only actin
  5. 10. the smallest functional unit of muscle
  6. 13. the specialized chemical synapse for communication between a motor neuron and skeletal muscle
Down
  1. 1. also known as thin filaments
  2. 2. also known as thick filaments
  3. 3. protein filaments of the muscle fiber that give skeletal muscle its striation
  4. 5. the middle layer of connective tissue surrounding each fascicle
  5. 7. long, cylindrical contractile units of the muscle fiber composed of myofilaments
  6. 11. also known as anisotropic bands, the dark band of the sarcomere containing both myosin and actin
  7. 12. the area where actin is anchored and also defines the boundaries of the sarcomere