Optical diffraction patterns from electron micrographs of both longitudinal and cross sections of normal and anomalous canine cardiac Z bands have been compared. The data indicate that anomalous cardiac Z bands resembling nemaline rods are structurally related to Z bands in showing a repeating lattice common to both. In thin sections transverse to the myofibril axis, both electron micrographs and optical diffraction patterns of the Z structure reveal a square lattice of 24 nm. This lattice is simple at the edge of each I band and centered in the interior of the Z band, where two distinct lattice forms have been observed. In longitudinal sections, oblique filaments visible in the electron micrographs correspond to a 38-nm axial periodicity in diffraction patterns of both Z band and Z rod. We conclude that the Z rods will be useful for further analysis and reconstruction of the Z lattice by optical diffraction techniques.
Skip Nav Destination
Article| December 01 1977
Optical diffraction of the Z lattice in canine cardiac muscle.
M A Goldstein
J P Schroeter
R L Sass
Online ISSN: 1540-8140
Print ISSN: 0021-9525
J Cell Biol (1977) 75 (3): 818–836.
M A Goldstein, J P Schroeter, R L Sass; Optical diffraction of the Z lattice in canine cardiac muscle.. J Cell Biol 1 December 1977; 75 (3): 818–836. doi: https://doi.org/10.1083/jcb.75.3.818
Download citation file: