JAPAN 1 Lecture Notes - Lecture 10: Motor Unit, Motor Neuron, Skeletal Muscle

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Muscle fibers are bundled together (in groups of 100) to form a fascicle. Each fascicle is encased by a connective tissue sheet -> perimysium. Endomysium of each fiber is bound to perimysium. Fascicles are bound together within epimysium -> this forms the muscle. Myofilaments are along the entire muscle fiber and the end attaches to the endomysium. When muscles are too long for myofilaments, the endomysium then attaches to the endomysium of the next muscle fiber; or to the perimysium of the next fascicle series; or to the epimysium of the entire muscle. This means that the connective tissue sheets of the muscle become bound together at the ends of the muscle. This connective tissue extends beyond the muscle and weaves itself into tendons (cords of connective tissue) or aponeuroses (sheets of connective tissue) The force of muscular contraction is transmitted from the endomysium of the muscle fiber. Tendon contains more ground substances at the insertion (more fibrocartilage)

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