Skeletal Muscle Tissue Explained: Structure, Fibers, And Function

Skeletal Muscle Tissue Explained: Structure, Fibers, And Function

Histology of Skeletal Muscle
Answer:

• The muscle present in relation to bony skeleton is called skeletal muscle
• Histology of skeletal muscle It is made up of

1. 1. Muscle fibres
      • They are long & cylindrical
      • They are arranged in bundles called fasciculi
      • Each muscle fibre is covered by a plasma membrane called sarcolemma
      • They contain:
        1. Nucleus
           • Elongated nucleus arranged along periphery
        2. Cytoplasm
           • It is called sarcoplasm
           • It contains usual cell organelles present near the nucleus
           • It also contains myofibrils
           • These fibrils are arranged in groups called the fields of Conheim
           • Between the myofibrils there is presence of membrane lined tubes called sarcoplasmic reticulum
           • Size of fibres:
             • Length30 cm
             • Diameter 10 to 60 micrometer
2. Skeletal Muscle Connective tissue
   • It supports & unites muscle fibres
   • The connective tissue surrounding individual muscle fibre is called endomysium
   • The connective tissue surrounding individual fasciculi is called perimysium
   • Finally the connective tissue surrounding the entire muscle is called the epimysium
     Striations:
   • The skeletal muscle shows prominent transverse striations
   • These striations on staining shows alternate dark & light bands
     1. A band
        • It is dark band
     2. I band
        • Light band of muscle
     3. Z band
        • It is a thin dark line present between I band
     4. H band
        • It is lighter band present between A band
     5. M Band
        • Thin dark line present in center of H band
        • The part present between two consecutive Z bands is called Sarcomere.