Fine structure and physiology of cardiac muscle in the spider, Dugesiella hentzi

Johnson, Ross Glenn

doi:10.31274/rtd-180813-17417

Cited by 2 publications

(2 citation statements)

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“…Although characteristics of the cardiac muscles with open circulatory system are commonly reported in insects (Auber 1967;Hagopian and Spiro 1967) and crustaceans (Atwood 1967;Fahrenbach 1967), few reports examine the fine structural features of sarcomere organization (Johnson 1968;Franzini-Armstrong 1974;Sherman 1987;Choi and Moon 2003;Kim and Moon 2018). In this study, we describe the fine structural characteristic of the cardiac muscles of the golden orb-web spider Nephila clavata.…”

Section: Introductionmentioning

confidence: 99%

Fine structure of the cardiac muscle cells in the orb-web spider Nephila clavata

2020

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The fine structural characteristics of cardiac muscle cells and its myofibril organization in the orb web spider N. clavata were examined by transmission electron microscopy. Although myofibril striations are not remarkable as those of skeletal muscles, muscle fibers contain multiple myofibrils, abundant mitochondria, extensive sarcoplasmic reticulum and transverse tubules (T-tubules). Myofibrils are divided into distinct sarcomeres defined by Z-lines with average length of 2.0 μm, but the distinction between the A-band and the I-bands is not clear due to uniform striations over the length of the sarcomeres. Dyadic junction which consisted of a single T-tubule paired with a terminal cisterna of the sarcoplasmic reticulum is found mainly at the A-I level of sarcomere. Each cell is arranged to form multiple connections with neighboring cells through the intercalated discs. These specialized junctions include three types of intercellular junctions: gap junctions, fascia adherens and desmosomes for heart function. Our transmission electron microscopy (TEM) observations clearly show that spider's cardiac muscle contraction is controlled by neurogenic rather than myogenic mechanism since each cardiac muscle fiber is innervated by a branch of motor neuron through neuromuscular junctions.

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Section: Introductionmentioning

confidence: 99%

Fine structure of the cardiac muscle cells in the orb-web spider Nephila clavata

2020

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“…The spider's heart is located in its abdomen above the intestine, and is not divided into chambers but consists of a simple tube with several valve-like openings. With the exception of the detailed work of Johnson (1968) and some other brief studies (Franzini-Armstrong 1974;Sherman 1987;Choi & Moon 2003), the spider's cardiac muscles have been nearly ignored so far.…”

Section: Introductionmentioning

confidence: 99%

Fine Structure of Cardiac Sarcomeres in the Black Widow Spider Latrodectus mactans

Kim

Moon

2018

Entomological Research

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Fine structural characteristics of the cardiac muscle and its sarcomere organization in the black widow spider, Latrodectus mactans were examined using transmission electron microscopy. The arrangement of cardiac muscle fibers was quite similar to that of skeletal muscle fibers, but they branched off at the ends and formed multiple connections with adjacent cells. Each cell contained multiple myofibrils and an extensive dyadic sarcotubular system consisting of sarcoplasmic reticulum and T‐tubules. Thin and thick myofilaments were highly organized in regular repetitive arrays and formed contractile sarcomeres. Each repeating band unit of the sarcomere had three apparent striations, but the H‐zone and M‐lines were not prominent. Myofilaments were arranged into distinct sarcomeres defined by adjacent Z‐lines with relatively short lengths of 2.0 μm to 3.3 μm. Cross sections of the A‐band showed hexagon‐like arrangement of thick filaments, but the orbit of thin filaments around each thick filament was different from that seen in other vertebrates. Although each thick filament was surrounded by 12 thin filaments, the filament ratio of thin and thick myofilaments varied from 3:1 to 5:1 because thin filaments were shared by adjacent thick filaments.

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Fine structure and physiology of cardiac muscle in the spider, Dugesiella hentzi

Cited by 2 publications

References 89 publications

Fine structure of the cardiac muscle cells in the orb-web spider Nephila clavata

Fine structure of the cardiac muscle cells in the orb-web spider Nephila clavata

Fine Structure of Cardiac Sarcomeres in the Black Widow Spider Latrodectus mactans

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