cardiac muscle fiber morphological measurement cardiac myocyte cross-sectional area striated cardiac muscle cell cross-sectional area cardiac muscle fiber cross-sectional area PMID:22258067 CMO:0003840 cardiomyocyte cross-sectional area 2021-09-09T18:12:17Z clinical_measurement_ontology heart muscle cell cross-sectional area A measurement of the extent of a plane through, that is, perpendicular to the axis of, a cardiac myocyte, striated muscle cells that are responsible for heart contraction. In mammals, the contractile fiber resembles those of skeletal muscle but are only one third as large in diameter, are richer in sarcoplasm, and contain centrally located instead of peripheral nuclei. slaulede cardiac fiber cross-sectional area