The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
Keiichi Matsuura - One of the best experts on this subject based on the ideXlab platform.
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Muscular System in the pacific bluefin tuna Thunnus orientalis (Teleostei: Scombridae)
Journal of Morphology, 2013Co-Authors: Masanori Nakae, Tokihiko Okada, Kunio Sasaki, Gento Shinohara, Keiichi MatsuuraAbstract:The Muscular System in the Pacific bluefin tuna Thunnus orientalis is studied in detail. For the first time, a complete description of the Muscular anatomy of a thunnid is provided here. Eighty-two elements including subdivisions of components of the Muscular System are identified. This is less than found in a basal perciform and two other investigated scombrid species, owing mainly to the absence or fusion of pectoral, pelvic and caudal fin muscles. The absence of elements of the basal perciform pattern was most prominent in the caudal fin, which includes only the flexor dorsalis, flexor ventralis, hypochordal longitudinalis, and interradialis. In the caudal fin, the medial fan-shaped ray was identified as the first dorsal ray, judging from myological and neuroanatomical characters. The highly developed gill filament muscles in Thunnus orientalis and sheet-like rectus communis control gill ventilation. Long body muscle tendons reduce the metabolic energy needed during rapid and continuous swimming. These characters are interpreted as adaptations in the context of the oceanic life style of the species. J. Morphol. 275:217–229, 2014. © 2013 Wiley Periodicals, Inc.
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Muscular System in the pacific bluefin tuna Thunnus orientalis (Teleostei: Scombridae)
Journal of morphology, 2013Co-Authors: Masanori Nakae, Tokihiko Okada, Kunio Sasaki, Gento Shinohara, Keiichi MatsuuraAbstract:The Muscular System in the Pacific bluefin tuna Thunnus orientalis is studied in detail. For the first time, a complete description of the Muscular anatomy of a thunnid is provided here. Eighty-two elements including subdivisions of components of the Muscular System are identified. This is less than found in a basal perciform and two other investigated scombrid species, owing mainly to the absence or fusion of pectoral, pelvic and caudal fin muscles. The absence of elements of the basal perciform pattern was most prominent in the caudal fin, which includes only the flexor dorsalis, flexor ventralis, hypochordal longitudinalis, and interradialis. In the caudal fin, the medial fan-shaped ray was identified as the first dorsal ray, judging from myological and neuroanatomical characters. The highly developed gill filament muscles in Thunnus orientalis and sheet-like rectus communis control gill ventilation. Long body muscle tendons reduce the metabolic energy needed during rapid and continuous swimming. These characters are interpreted as adaptations in the context of the oceanic life style of the species.
Masanori Nakae - One of the best experts on this subject based on the ideXlab platform.
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Muscular System in the pacific bluefin tuna Thunnus orientalis (Teleostei: Scombridae)
Journal of Morphology, 2013Co-Authors: Masanori Nakae, Tokihiko Okada, Kunio Sasaki, Gento Shinohara, Keiichi MatsuuraAbstract:The Muscular System in the Pacific bluefin tuna Thunnus orientalis is studied in detail. For the first time, a complete description of the Muscular anatomy of a thunnid is provided here. Eighty-two elements including subdivisions of components of the Muscular System are identified. This is less than found in a basal perciform and two other investigated scombrid species, owing mainly to the absence or fusion of pectoral, pelvic and caudal fin muscles. The absence of elements of the basal perciform pattern was most prominent in the caudal fin, which includes only the flexor dorsalis, flexor ventralis, hypochordal longitudinalis, and interradialis. In the caudal fin, the medial fan-shaped ray was identified as the first dorsal ray, judging from myological and neuroanatomical characters. The highly developed gill filament muscles in Thunnus orientalis and sheet-like rectus communis control gill ventilation. Long body muscle tendons reduce the metabolic energy needed during rapid and continuous swimming. These characters are interpreted as adaptations in the context of the oceanic life style of the species. J. Morphol. 275:217–229, 2014. © 2013 Wiley Periodicals, Inc.
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Muscular System in the pacific bluefin tuna Thunnus orientalis (Teleostei: Scombridae)
Journal of morphology, 2013Co-Authors: Masanori Nakae, Tokihiko Okada, Kunio Sasaki, Gento Shinohara, Keiichi MatsuuraAbstract:The Muscular System in the Pacific bluefin tuna Thunnus orientalis is studied in detail. For the first time, a complete description of the Muscular anatomy of a thunnid is provided here. Eighty-two elements including subdivisions of components of the Muscular System are identified. This is less than found in a basal perciform and two other investigated scombrid species, owing mainly to the absence or fusion of pectoral, pelvic and caudal fin muscles. The absence of elements of the basal perciform pattern was most prominent in the caudal fin, which includes only the flexor dorsalis, flexor ventralis, hypochordal longitudinalis, and interradialis. In the caudal fin, the medial fan-shaped ray was identified as the first dorsal ray, judging from myological and neuroanatomical characters. The highly developed gill filament muscles in Thunnus orientalis and sheet-like rectus communis control gill ventilation. Long body muscle tendons reduce the metabolic energy needed during rapid and continuous swimming. These characters are interpreted as adaptations in the context of the oceanic life style of the species.
Elena N Temereva - One of the best experts on this subject based on the ideXlab platform.
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Development, organization, and remodeling of phoronid muscles from embryo to metamorphosis (Lophotrochozoa: Phoronida)
BMC Developmental Biology, 2013Co-Authors: Elena N Temereva, Eugeni B TsitrinAbstract:Background The phoronid larva, which is called the actinotrocha, is one of the most remarkable planktotrophic larval types among marine invertebrates. Actinotrochs live in plankton for relatively long periods and undergo catastrophic metamorphosis, in which some parts of the larval body are consumed by the juvenile. The development and organization of the Muscular System has never been described in detail for actinotrochs and for other stages in the phoronid life cycle. Results In Phoronopsis harmeri , Muscular elements of the preoral lobe and the collar originate in the mid-gastrula stage from mesodermal cells, which have immigrated from the anterior wall of the archenteron. Muscles of the trunk originate from posterior mesoderm together with the trunk coelom. The organization of the Muscular System in phoronid larvae of different species is very complex and consists of 14 groups of muscles. The telotroch constrictor, which holds the telotroch in the larval body during metamorphosis, is described for the first time. This unusual muscle is formed by apical myofilaments of the epidermal cells. Most larval muscles are formed by cells with cross-striated organization of myofibrils. During metamorphosis, most elements of the larval Muscular System degenerate, but some of them remain and are integrated into the juvenile musculature. Conclusion Early steps of phoronid myogenesis reflect the peculiarities of the actinotroch larva: the muscle of the preoral lobe is the first muscle to appear, and it is important for food capture. The larval Muscular System is organized in differently in different phoronid larvae, but always exhibits a complexity that probably results from the long pelagic life, planktotrophy, and catastrophic metamorphosis. Degeneration of the larval Muscular System during phoronid metamorphosis occurs in two ways, i.e., by complete or by incomplete destruction of larval Muscular elements. The organization and remodeling of the Muscular System in phoronids exhibits the combination of protostome-like and deuterostome-like features. This combination, which has also been found in the organization of some other Systems in phoronids, can be regarded as an important characteristic and one that probably reflects the basal position of phoronids within the Lophotrochozoa.
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First report of diagonal musculature in phoronids (Lophophorata: Phoronida).
Doklady biological sciences : proceedings of the Academy of Sciences of the USSR Biological sciences sections, 2010Co-Authors: A. V. Chernyshev, Elena N TemerevaAbstract:Phoronids are excclusively marine benthic animalswidespread throughout the ocean. The phoronids'position on the Bilateria phylogenetic tree remainsunclear and is a subject of heated discussions, becausethe data of comparative anatomy and embryology [5,7, 9] are in contradiction with the results obtained bymolecular phylogenetics [3, 6]. New data on the structure and development of phoronids would be helpful insolution of this problem. In this regard, studying themorphology and ultrastructure of phoronids isrequired. The phoronid Muscular System, which is wellstudied on the lightmicroscopy level, remains largelyunexplored by the modern methods of electron andlaser confocal microscopy. At the same time, thephoronid Muscular System ensures complex behavior:a rapid body retraction into the tube in danger, movement along the tube, etc. Understanding the organization of the phoronid Muscular System may provide aclue to solving some problems of functional morphology of these animals, which remains poorly studied todate. Using new methods, the previously unknowndiagonal muscles have been found in phoronids,which were described in detail and studied in terms offunctional morphology.The subjects of our study were adult phoronids
Eugeni B Tsitrin - One of the best experts on this subject based on the ideXlab platform.
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Development, organization, and remodeling of phoronid muscles from embryo to metamorphosis (Lophotrochozoa: Phoronida)
BMC Developmental Biology, 2013Co-Authors: Elena N Temereva, Eugeni B TsitrinAbstract:Background The phoronid larva, which is called the actinotrocha, is one of the most remarkable planktotrophic larval types among marine invertebrates. Actinotrochs live in plankton for relatively long periods and undergo catastrophic metamorphosis, in which some parts of the larval body are consumed by the juvenile. The development and organization of the Muscular System has never been described in detail for actinotrochs and for other stages in the phoronid life cycle. Results In Phoronopsis harmeri , Muscular elements of the preoral lobe and the collar originate in the mid-gastrula stage from mesodermal cells, which have immigrated from the anterior wall of the archenteron. Muscles of the trunk originate from posterior mesoderm together with the trunk coelom. The organization of the Muscular System in phoronid larvae of different species is very complex and consists of 14 groups of muscles. The telotroch constrictor, which holds the telotroch in the larval body during metamorphosis, is described for the first time. This unusual muscle is formed by apical myofilaments of the epidermal cells. Most larval muscles are formed by cells with cross-striated organization of myofibrils. During metamorphosis, most elements of the larval Muscular System degenerate, but some of them remain and are integrated into the juvenile musculature. Conclusion Early steps of phoronid myogenesis reflect the peculiarities of the actinotroch larva: the muscle of the preoral lobe is the first muscle to appear, and it is important for food capture. The larval Muscular System is organized in differently in different phoronid larvae, but always exhibits a complexity that probably results from the long pelagic life, planktotrophy, and catastrophic metamorphosis. Degeneration of the larval Muscular System during phoronid metamorphosis occurs in two ways, i.e., by complete or by incomplete destruction of larval Muscular elements. The organization and remodeling of the Muscular System in phoronids exhibits the combination of protostome-like and deuterostome-like features. This combination, which has also been found in the organization of some other Systems in phoronids, can be regarded as an important characteristic and one that probably reflects the basal position of phoronids within the Lophotrochozoa.
Kunio Sasaki - One of the best experts on this subject based on the ideXlab platform.
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Muscular System in the pacific bluefin tuna Thunnus orientalis (Teleostei: Scombridae)
Journal of Morphology, 2013Co-Authors: Masanori Nakae, Tokihiko Okada, Kunio Sasaki, Gento Shinohara, Keiichi MatsuuraAbstract:The Muscular System in the Pacific bluefin tuna Thunnus orientalis is studied in detail. For the first time, a complete description of the Muscular anatomy of a thunnid is provided here. Eighty-two elements including subdivisions of components of the Muscular System are identified. This is less than found in a basal perciform and two other investigated scombrid species, owing mainly to the absence or fusion of pectoral, pelvic and caudal fin muscles. The absence of elements of the basal perciform pattern was most prominent in the caudal fin, which includes only the flexor dorsalis, flexor ventralis, hypochordal longitudinalis, and interradialis. In the caudal fin, the medial fan-shaped ray was identified as the first dorsal ray, judging from myological and neuroanatomical characters. The highly developed gill filament muscles in Thunnus orientalis and sheet-like rectus communis control gill ventilation. Long body muscle tendons reduce the metabolic energy needed during rapid and continuous swimming. These characters are interpreted as adaptations in the context of the oceanic life style of the species. J. Morphol. 275:217–229, 2014. © 2013 Wiley Periodicals, Inc.
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Muscular System in the pacific bluefin tuna Thunnus orientalis (Teleostei: Scombridae)
Journal of morphology, 2013Co-Authors: Masanori Nakae, Tokihiko Okada, Kunio Sasaki, Gento Shinohara, Keiichi MatsuuraAbstract:The Muscular System in the Pacific bluefin tuna Thunnus orientalis is studied in detail. For the first time, a complete description of the Muscular anatomy of a thunnid is provided here. Eighty-two elements including subdivisions of components of the Muscular System are identified. This is less than found in a basal perciform and two other investigated scombrid species, owing mainly to the absence or fusion of pectoral, pelvic and caudal fin muscles. The absence of elements of the basal perciform pattern was most prominent in the caudal fin, which includes only the flexor dorsalis, flexor ventralis, hypochordal longitudinalis, and interradialis. In the caudal fin, the medial fan-shaped ray was identified as the first dorsal ray, judging from myological and neuroanatomical characters. The highly developed gill filament muscles in Thunnus orientalis and sheet-like rectus communis control gill ventilation. Long body muscle tendons reduce the metabolic energy needed during rapid and continuous swimming. These characters are interpreted as adaptations in the context of the oceanic life style of the species.
