Ultrastructure of Atrial and Ventricular Myocardium in the Pike Esox Lucius L. and Mackerel Scomber Scombrus L. (pisces)

Overview

Journal Cell Tissue Res

Specialties Anatomy & Histology
Cell Biology

Date 1980 Jan 1

PMID 7407886

Citations 5

Authors

B Midttun

Affiliations

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Abstract

Atrial and ventricular muscle in the pike and mackerel hearts consists of narrow, branching cells. The atrial cells in the two species are similar whereas the ventricular cells differ. The sarcolemma is attached to the Z and M lines of the sarcomere. Intercalated discs are common, and the transverse parts display desmosomes and intermediate junctions. Nexuses are uncommon and only occur in the longitudinal parts of the intercalated discs. The sarcoplasmic reticulum forms a regular hexagonal network on the myofibrillar surface. Subsarcolemmal cisternae form peripheral couplings at the I--A level. Junctional processes are usually inconspicuous, but an electron dense substance is present between the sarcolemma and the junctional sarcoplasmic reticulum. Specific heart granules are common in atrial cells of both species and in ventricular cells of the pike, but are very scarce in mackerel ventricular muscle.

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