Morphometric analysis of myocardial cells in a teleost.

Morphometric parameters are described for myocardial cells in the ventricle and atrium in a teleost, Gadus virens L. The myofibrils volume fractions are 73 and 78% in ventricle and atrium, respectively. The corresponding values for mitochondria and sarcoplasmic reticulum are 23 and 20%, and 0.5 and 0.4%. The muscle cells in the ventricle contain more glycogen than the atrial ones. The morphometric parameters are compared with those previously reported for cardiac muscle cells in mammals.