TY - JOUR
T1 - Fine structure of the heart in the Japanese Medaka, Oryzias latipes
AU - Lemanski, Larry F.
AU - Fitts, E. Payson
AU - Marx, Barry S.
N1 - Funding Information:
We thank Dr. Lee D. Peachey for the use of his electron microscope facilities, and Mrs. Sharon Le-manski for her technical and secretarial assistance. This study was supported by a postdoctoral fellowship and research grant from the Muscular Dystrophy Associations of America, Inc., by NIH Grants HL-18480 and HL-15835 and, in part, by grants from the Academic Senate of the Research Evaluation and Allocation Committee of the University of California, San Francisco.
PY - 1975/10
Y1 - 1975/10
N2 - Heart morphology in the small freshwater teleost, Japanese Medaka, (oryzias latipes) was studied by light and electron microscopy. Particular attention was directed to the three heart layers, epicardium, myocardium, and endocardium in the atrial and ventricular portions of the organ. The trabeculae originate and insert into the myocardial wall forming many complex anastomoses and interdigitations. The entire ventricle is trabeculated giving the chamber a "spongy" appearance; the atrium is less extensively trabeculated. The epicardial layer forms an outer covering over the organ and is composed of simple squamous epithelial cells. The myocardial cells of the trabeculae have small diameters but extend for considerable distances. The myofibrils usually are located peripherally, while the nucleus, mitochondria, and other cellular organelles are located centrally. The myofibrils exhibit a typical vertebrate structure with distinct A-bands, I-bands, and Z-lines; H-zones are discernible but appear less prominent than in higher vertebrates. Intercalated disks have fasciae adherentes and maculae adherentes (desmosomes) as component parts. Although a distinct T-system is absent, prominent subsarcolemmal cisternae are located in the I-band areas and there is a moderately well-developed sarcoplasmic reticulum. The endocardium is composed of a continuous layer of cells that appear to be metabolically very active. Filling the cytoplasm of these cells are large numbers of rough endoplasmic reticulum cisternae and associated mitochondria, vesicles containing amorphous material, and large round bodies with consistencies varying from dense to amorphous to filamentous.
AB - Heart morphology in the small freshwater teleost, Japanese Medaka, (oryzias latipes) was studied by light and electron microscopy. Particular attention was directed to the three heart layers, epicardium, myocardium, and endocardium in the atrial and ventricular portions of the organ. The trabeculae originate and insert into the myocardial wall forming many complex anastomoses and interdigitations. The entire ventricle is trabeculated giving the chamber a "spongy" appearance; the atrium is less extensively trabeculated. The epicardial layer forms an outer covering over the organ and is composed of simple squamous epithelial cells. The myocardial cells of the trabeculae have small diameters but extend for considerable distances. The myofibrils usually are located peripherally, while the nucleus, mitochondria, and other cellular organelles are located centrally. The myofibrils exhibit a typical vertebrate structure with distinct A-bands, I-bands, and Z-lines; H-zones are discernible but appear less prominent than in higher vertebrates. Intercalated disks have fasciae adherentes and maculae adherentes (desmosomes) as component parts. Although a distinct T-system is absent, prominent subsarcolemmal cisternae are located in the I-band areas and there is a moderately well-developed sarcoplasmic reticulum. The endocardium is composed of a continuous layer of cells that appear to be metabolically very active. Filling the cytoplasm of these cells are large numbers of rough endoplasmic reticulum cisternae and associated mitochondria, vesicles containing amorphous material, and large round bodies with consistencies varying from dense to amorphous to filamentous.
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U2 - 10.1016/S0022-5320(75)80085-2
DO - 10.1016/S0022-5320(75)80085-2
M3 - Article
C2 - 171438
AN - SCOPUS:0016817933
SN - 0022-5320
VL - 53
SP - 37
EP - 65
JO - Journal of Ultrasructure Research
JF - Journal of Ultrasructure Research
IS - 1
ER -