Atlas of the Ultrastructure of Diseased Human Muscle by W G P Mair and F M S Tomé (Auth.)

By W G P Mair and F M S Tomé (Auth.)

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Adult. In the adult heart the intercalated discs between adjacent myocardial cells are very extensive and the contiguous surfaces of the cells are very tortuous, without any basement membrane intervening between the cells. The broadened zones of electron dense material in the adjacent cells correspond to the Z-lines of the sarcomere. The mitochondria are swollen and the space between the myofibrils is fairly wide due perhaps to post mortem change. MAGNIFICATION 26,000 x. Human auricle obtained post mortem.

G. Engel (1967). Another structure which sometimes is observed in diseased muscle is the 'cytoplasmic body' reported by Macdonald and A. G. Engel (1969) as a structural anomaly of the Z-line. Cytoplasmic bodies were first described in light microscopy in human skeletal muscle and in tissue cultures of chicken embryo muscle by W. K . Engel (1962). By electron microscopy the cytoplasmic body is seen to be formed of filaments, 1 CHANGES IN MUSCLE FIBRES 49 those in the centre being closely packed and electron dense while those at the periphery are more loosely arranged and less electron dense.

MAGNIFICATION 26,000 Ax BM C F MF MN x. Axon Basement membrane Collagen Fibroblast Muscle fibre Myelinated nerve N Nucleus PN Perineurial cell SC Schwann cell SCC Schwann cell cytoplasm SCP Schwann cell process 28 ATLAS OF THE ULTRASTRUCTURE OF DISEASED HUMAN MUSCLE PLATE 8. NORMAL MOTOR END PLATE Three sections of a terminal axon lie in the primary synaptic cleft on the surface of this muscle fibre. Cytoplasm of the Schwann cell with its layers of plasma and basement membrane cover the outer aspect of the axon.

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