Minayori Kumamoto
Kyoto University
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Featured researches published by Minayori Kumamoto.
Anatomical Record-advances in Integrative Anatomy and Evolutionary Biology | 2016
Tsutomu Miyake; Minayori Kumamoto; Masamitsu Iwata; Ryuichi Sato; Masataka Okabe; Hiroshi Koie; Nori Kumai; Kenichi Fujii; Koji Matsuzaki; Chiho Nakamura; Shinya Yamauchi; Kosuke Yoshida; Kohtaroh Yoshimura; Akira Komoda; Teruya Uyeno; Yoshitaka Abe
To investigate the morphology and evolutionary origin of muscles in vertebrate limbs, we conducted anatomical dissections, computed tomography and kinematic analyses on the pectoral fin of the African coelacanth, Latimeria chalumnae. We discovered nine antagonistic pairs of pronators and supinators that are anatomically and functionally distinct from the abductor and adductor superficiales and profundi. In particular, the first pronator and supinator pair represents mono‐ and biarticular muscles; a portion of the muscle fibers is attached to ridges on the humerus and is separated into two monoarticular muscles, whereas, as a biarticular muscle, the main body is inserted into the radius by crossing two joints from the shoulder girdle. This pair, consisting of a pronator and supinator, constitutes a muscle arrangement equivalent to two human antagonistic pairs of monoarticular muscles and one antagonistic pair of biarticular muscles in the stylopod between the shoulder and elbow joints. Our recent kinesiological and biomechanical engineering studies on human limbs have demonstrated that two antagonistic pairs of monoarticular muscles and one antagonistic pair of biarticular muscles in the stylopod (1) coordinately control output force and force direction at the wrist and ankle and (2) achieve a contact task to carry out weight‐bearing motion and maintain stable posture. Therefore, along with dissections of the pectoral fins in two lungfish species, Neoceratodus forsteri and Protopterus aethiopicus, we discuss the functional and evolutionary implications for the fin‐to‐limb transition and subsequent evolution of tetrapods. Anat Rec, 299:1203–1223, 2016.
international workshop on advanced motion control | 2004
Minayori Kumamoto
The two-joint link mechanism provided with one antagonistic pair of the bi-articular actuators in addition to two antagonistic pairs of the mono-articular actuators could demonstrate perfect coordination of these actuators with only single command signal informing output force direction, and could lead smooth, rapid and precise movements without use of positional feedback signal from the endpoint, i.e. an open loop control. Further, the mechanism could demonstrate stable postural control against external disturbances, and dissolve contact task.
The Journal of Membrane Biology | 1978
Ikunobu Muramatsu; Minayori Kumamoto; Motohatsu Fujiwara
SummaryMembrane ionic currents were measured in pregnant rat uterine smooth muscle under voltage clamp conditions by utilizing the double sucrose gap method, and the effects of conditioning pre-pulses on these currents were investigated. With depolarizing pulses, the early inward current was followed by a late outward current. Cobalt (1mm) abolished the inward current and did not affect the late outward currentper se, but produced changes in the current pattern, suggesting that the inward current overlaps with the initial part of the late outward current. After correction for this overlap, the inward current reached its maximum at about +10 mV and its reversal potential was estimated to be +62 mV. Tetraethylammonium (TEA) suppressed the outward currents and increased the apparent inward current. The increase in the inward current by TEA thus could be due to a suppression of the outward current. The reversal potential for the outward current was estimated to be −87 mV. Conditioning depolarization and hyperpolarization both produced a decrease in the inward current. Complete depolarization block occurred at a membrane potential of −20 mV. Conditioning hyperpolarization experiments in the presence of cobalt and/or TEA revealed that the decrease in the inward current caused by conditioning hyperpolarization was a result of an increase in the outward current overlapping with the inward current. It appears that a part of the potassium channel population is inactivated at the resting membrane potential and that this inactivation is removed by hyperpolarization.
Journal of Orthopaedic Science | 1999
Osamu Kameyama; Kesuke Shibano; Hirofumi Kawakita; Ryokei Ogawa; Minayori Kumamoto
Japan Journal of Physical Education, Health and Sport Sciences | 1974
Hiroko Yoshio; Kimisaburo Takagi; Minayori Kumamoto; Minoru Ito; Kazuo Ito; Noriyoshi Yamashita; Tsutomu Okamoto; Hiroshi Nakagawa
Journal of Biomechanics | 1989
Hideo Oka; Tsutomu Okamoto; Minayori Kumamoto
Japan Journal of Physical Education, Health and Sport Sciences | 1967
Tsutomu Okamoto; Kimisaburo Takagi; Minayori Kumamoto
The journal of Kansai Medical University | 1989
Osamu Kameyama; Ryokei Ogawa; Minayori Kumamoto; Tsutomu Okamoto
Japan Journal of Physical Education, Health and Sport Sciences | 1976
Nobuyuki Kazai; Minayori Kumamoto; Tsutomu Okamoto; Noriyoshi Yamashita; Yukihiro Goto; hirotake Maruyama
Japan Journal of Physical Education, Health and Sport Sciences | 1974
Kenji Matsushita; Yukihiro Goto; Tsutomu Okamoto; Akira Tsujino; Minayori Kumamoto