Muscle tissue

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Muscle tissue

  1. 1. Smooth muscle (HE)Skeletal muscle (cross section HE)Skeletal muscle (longitudinal section HE)
  2. 2. Smooth muscle HM, 40x (HE)Smooth muscle cell (one nucleus, thin, bobbin shape)The cells arranged in fasciculi.The nucleus is localised in the centre of the cell. There are no striated Smooth muscle nucleus
  3. 3. The functional unit of it is the muscular fibreThere is a fusion of the myoblast cells during the ontogenesisThe number of nuclei may be more than 100
  4. 4. Skeletal muscle cross section, 20x (HE) Perimysium Endomysium (Cohnheim field)Epimysium
  5. 5. Skeletal muscle cross section, 40x (HE)
  6. 6. The bands, which are dyed dark, show a double refraction of light. That swhy these are Anisotropes (A)The bands, which are dyed light, have single refraction of light Isotropes (I)There is a thin line in the middle of the I-band, which is called Z-bandThere is a lighter line in the middle of the A-band, which is called H-bandand int he middle of this lighter line there is a dark line, the M-line.The I-band becomes shorter when the muscle contractsThose contractile elements which show striated pattern is calledmyofibrils.The place which is between two Z-bands is called sarcomerThe myofibrillum consists of myofilaments.thin (9 nm actin)thick (12-15 nm myosin)
  7. 7. Skeletal musclentcsíkolt izom Hará (longitudinal HM, 40x (HE)section, 40x (HE) Fibrocyte nucleus Muscle cell nuclei Striated pattern

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